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  20 THINGS #57:
  RAGING SWAN PRESS
  BESIEGED CASTLE
  SYSTEM  
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  20 THINGS #57: BESIEGED CASTLE 
  Are you a busy GM? Does session prep take too long? Do you never have time to work on the cool little details that can bring your 
  session to life? Well fear not! That’s where the 20 Things line comes in. This short, focused compilation gives you, the time-crunched 
  GM, the tools to effortlessly add verisimilitude and detail to your adventure. Use the material herein either before or during play and 
  bask in your players' adulation. 
  This instalment provides ﬁve pages of material compatible with virtually any fantasy roleplaying game and is designed to help you 
  ﬂesh out and bring to life the besieged castles in your campaign. 
  C RE DI TS 
  Design: Creighton Broadhurst and Mike Welham 
  Development: Creighton Broadhurst  
  Art: Paul Daly and William McAusland. Some artwork copyright 
  William McAusland, used with permission. Some artwork 
  copyright Paul Daly, used with permission. 
  All rights reserved. No part of this publication may be reproduced, 
  stored in a retrieval system or transmitted, in any form or by any 
  means, without the prior permission in writing of Raging Swan 
  Press or as expressly permitted by law. 
  ©Raging Swan Press 2021. 
  U SIN G THI S BOOK 
  You can use these system neutral tables either during session 
  prep or “on the fly” during the actual session. Roll on the 
  desired table and describe the result. Remember: 
  •
  Some players may assume because you describe something 
  it is important. This may slow down the party’s progress 
  through the adventure. This isn’t necessarily a bad thing. 
  •
  Modify any result so it fit with your game. 
  •
  Ignore or re-roll inappropriate results. 
  •
  Have fun! 
  CONTENTS 
  To contact us, email gatekeeper @ragingswan.com 
  To learn more about Raging Swan Press, visit ragingswan.com  
  To learn more about Raging Swan Press on Patreon, visit 
  patreon.com/ragingswanpress 
  Credits 
  1 
  ....................................................................................................
  Using this Book 
  1 
  ......................................................................................
  Contents 
  1 
  .................................................................................................
  1: Minor Events 
  2 
  ......................................................................................
  Daytime Events 
  2 
  ...............................................................................
  Night-Time Events 
  2 
  ...........................................................................
  2: Attacks 
  4 
  ................................................................................................
  Defences and Counterattacks 
  4 
  .......................................................
  3: Challenges & Complications 
  6 
  ...........................................................
  Dwindling Supplies 
  6 
  ........................................................................
  Low Morale 
  6 
  ......................................................................................
  OGL V1.0A 
  7
  .............................................................................................
  
  1: MI N O R EVE NTS 
  The besiegers and the defenders must contend with the vagaries 
  of nature, logistics, morale and their enemies. The minor events 
  below will not turn the siege’s tide in anyone’s favour, but canny 
  commanders can use them to their advantage. 
  DAYTIME EVENTS 
  Most of the action in a castle siege takes place during the day, 
  unless many of the combatants can see in the dark.  
  1.
  A messenger pigeon avoids an arrow storm, but relief at the 
  bird’s survival is short-lived. It arrives with dire news: a week-
  long delay for expected reinforcements and supplies. 
  2.
  A mercenary band arrives to offer their services at an 
  exorbitant fee. However, they prove more than capable as 
  ﬁghters and boast an elven sharpshooting archer who can 
  easily pick off foes at great range. If rebuffed, they threaten to 
  make a similar offer to the enemy. 
  3.
  Steady rain has turned the surrounding land into a mire, 
  which gives the defenders a break from battering rams and 
  other direct attacks from siege engines. However, the enemy 
  forces continue to use catapults. 
  4.
  A kettle of vultures circles overhead, potentially unnerving 
  those in the castle or among the besieging army. 
  Alternatively, an unkindness of ravens or other group of 
  portentous (either good- or ill-omened) birds ﬂocks to the 
  ramparts and begins calling loudly. 
  5.
  One of the castle’s towers collapses, providing the besieging 
  army easy access to the castle. As the siege-laying army 
  clambers over the rubble, defenders must turn them away 
  and strive to make the pile of rubble unclimbable. 
  6.
  A lightning strike or errant ember ignites dry vegetation. The 
  ﬁre builds and threatens to sweep across the battleﬁeld. 
  While the castle acts as an inherent buffer against the ﬁre, 
  smoke inhalation or ﬁery material carried aloft by the wind 
  pose threats to the defenders. 
  7.
  Strong winds blow away from the castle toward the enemy (or 
  vice versa). Powerful gusts render the use of incendiary 
  munitions a dangerous prospect. 
  8.
  A well-respected leader of the castle garrison dies in battle, 
  from natural causes or through foul play. Regardless of the 
  circumstances, members of the guard must quickly pay their 
  respects to their fallen leader. If the cause of death is suspect, 
  it prompts an investigation, provided it does not interfere with 
  the castle’s defence. 
  9.
  A seemingly neutral party arrives under the ﬂag of peace to 
  negotiate the cessation of hostilities. Their purpose for doing 
  so may be purely altruistic or may conceal sinister intentions 
  for either side of the conﬂict. 
  10. A massive crack forms in the castle’s foundation due to the 
  strain of repeated attacks by siege engines or through a shift 
  in the underlying earth. A team of engineers must repair the 
  crack before it spreads and creates an opening through which 
  the invaders can pour. 
  NIGHT-TIME EVENTS 
  Though ﬁghting may stop once night falls, minor incidents still 
  occur. Additionally, both sides use the quiet and cover of night to 
  plot or conduct espionage or sabotage.  
  1.
  The full moon, previously cloaked by clouds, becomes free of 
  its obscurement and gives the defenders a clear view of the 
  enemy encampment. 
  2.
  An explosion shakes the castle, waking all but the soundest of 
  sleepers. The explosion’s source is unclear even to the night 
  watch, but the castle appears undamaged. Unfortunately, a 
  fraught wait until morning is required before the defenders 
  can make a true assessment. 
  3.
  A small group from the besieging army attempts to inﬁltrate 
  the castle. They plan to scout the castle’s defences, inhibit the 
  defenders’ ability to hold off the siege or create an opening 
  (or enlarge an existing one) so a larger force can break in. 
  4.
  The night grows quiet, as the enemy seems to settle down for 
  the night. Suddenly, wolf howls from too near the castle break 
  the silence. Are the wolves preying on the besiegers or part 
  of their forces?  
  5.
  A member of the besieging encampment loudly plays a 
  discordant tune on a brass instrument. The instrument’s 
  player keeps the racket up for the entire night, and the sound 
  penetrates even the densest castle walls. The rest of the 
  encampment is either used to the noise or uses wax or 
  another means to deaden it. 
  6.
  A group of commoners displaced by the conﬂict threads its 
  way through the enemy encampment. The people seek 
  shelter in the castle and offer to help in any way they can, but 
  their numbers threaten the already dwindling supplies. A spy 
  or assassin could lurk among the refugees. 
  7.
  A meteorite streaks across the night sky. Augurs from both 
  sides try to ascertain whether its appearance bodes good or 
  evil. Likewise, a partial or full lunar eclipse, or the appearance 
  of a comet or other celestial event, might provoke concern 
  about its portent. 
  8.
  Members of the night watch hear the sounds of construction 
  from behind a copse. Campﬁre light necessary for the 
  builders to see their work illuminates the top of a siege 
  engine visible over the tallest trees. 
  9.
  A team from the besieging force begins, or continues 
  digging, a tunnel under the castle. They have chosen a 
  location where their digging cannot be heard or do their 
  work while a louder sound (for example, the cacophonous 
  instrument playing in #5) conceals their toil. 
  10. Rain (either a continuation of the rain from daytime event #3 
  or a fresh storm) douses campﬁres and makes conditions 
  miserable for the besiegers. Fortunately, the structure 
  provides a respite for everyone but the night watch. 
  2
  
   
  3
  
  2: AT TACKS 
  The besieging force will likely try a number of inventive tactics to 
  breach the castle’s walls. Use this list below, to generate the basic 
  details of such actions. 
  1.
  Warriors run toward the castle walls carrying long ladders. 
  Some of the attackers carry tower shields, and these warriors 
  are ﬁrst up the ladders. They hold the shields above their 
  heads to protect themselves from the defenders’ missiles. On 
  the ground, archers unleash a storm of arrows to keep the 
  defenders’ head down. 
  2.
  The attackers draw up several wagons ﬁlled with wood, straw 
  and other combustible materials. Much of the material piled 
  into the wagon is damp. When the wind blows in the right 
  direction—toward the castle—they set the wagons aﬂame. 
  Smoke billows from the wagons, which the attackers begin to 
  push toward the castle walls. Behind the wagons, obscured in 
  the smoke, lurks the assault force. 
  3.
  At dusk, the enemy draw up a large force opposite one of the 
  castle’s walls. The warriors make a lot of noise—banging their 
  weapons on their shields, taunting the defenders, singing and 
  so on. The spectacle goes on as night falls. The display is a 
  diversion—several enemy champions creep toward another 
  wall intent on using stealth to enter the castle. Once inside, 
  they plan to open the main gates for their fellows. 
  4.
  The attackers dig a tunnel to undermine a wall or tower. 
  Observant characters—or perhaps those sent out to disrupt 
  the enemy camp—spot the tunnel entrance, or the hidden 
  piles of spoils carried away from the tunnel. When the tunnel 
  is ﬁnished, the sappers plan to pack it with oil-soaked wood 
  and set it on ﬁre. The resultant collapse should cause a 
  collapse and breach the castle defences. 
  5.
  The enemy pile a wagon full of barrels of oil and other highly 
  ﬂammable substances. To dissuade the castle defenders from 
  shooting at the wagon, they tie (or nail) captives taken from 
  the surrounding locality to the front and sides of the wagon. 
  When the enemy are ready to attack, heavily armoured 
  warriors push the wagon towards the castle gates. 
  6.
  As number 5 above, but instead of captives the enemy have 
  “armoured” the wagon by nailing many shields to its sides, 
  front and over its wheels. 
  7.
  Using sword and ﬂame, the attacking troops drive a huge 
  herd of cattle at the castle gates. They hope either the 
  panicked animals will sunder the gate in their panic to escape 
  or the heaps of dead animals will pile so high they can use 
  them to scale the walls. 
  8.
  The enemy use catapults to hurl balls of pitch-soaked ﬂaming 
  hay bales and the like against the castle walls. The ﬂaming 
  missiles do no damage but create dense clouds of smoke 
  which hide an imminent attack. 
  9.
  The enemy have many captives and slaves. They set the 
  captives free and drive them toward the castle. They then 
  charge forward. Quickly, the two groups become 
  intermingled, making it hard for the defenders to target the 
  enemy’s warriors without injuring or killing the innocents 
  desperately trying to reach the safety of the castle. 
  10. Pairs of allied (perhaps mercenary) giants carry wagons full of 
  enemy warriors toward the castle walls, which they plan to lift 
  up onto the battlements. The warriors within are equipped 
  with heavy shields and lengths of knotted rope. They plan to 
  clear a stretch of the wall, let down their ropes and hold the 
  breach until their fellows arrive. 
  11. The besieging force uses catapults to hurl the diseased 
  bodies of animals—and perhaps even their own dead—over 
  the castle walls. 
  12. The besieging force sends a small group to offer parley and 
  to ask for the garrison’s surrender. This is a trick, and a small 
  band of elite warriors use the distraction to creep toward a 
  lightly defended section of wall. 
  DEFENCES AND COUNTERAT TACKS 
  Given enough time, the castle’s defenders can devise numerous 
  countermeasures to withstand a siege. Oftentimes, though, attacks 
  come with less warning, requiring impromptu solutions. Use the 
  list below to set up the castle’s existing defences along with any 
  countermeasures used during the heat of battle. 
  1.
  A water-ﬁlled moat is one of the surest defences against 
  battering rams and other siege engines used to directly attack 
  the castle. If a moat proves impractical, a small team can dig 
  strategically placed trenches and cover them with natural 
  material to conceal them. Additionally, breaking up the 
  ground around the castle hinders ladder placement. 
  2.
  Several cauldrons stand in the castle grounds fed by wood- 
  and coal-burning ﬁres. While the inhabitants may have to 
  suffer cold nights, the cauldrons ﬁlled with water, sand or oil 
  provide a deadly threat to invaders using scaling ladders. 
  3.
  A supply of quarried stones acts as ammunition for catapults 
  situated within the castle. These stones can destroy opposing 
  siege engines or ﬂatten swaths of enemy combatants. In dire 
  situations, livestock or corpses can serve as missiles. 
  4.
  Rounding castle walls helps deﬂect battering rams and make 
  the walls less susceptible to breaching. Though less effective, 
  grease, liquid fat or other slick substances create a similar 
  effect in a pinch. 
  5.
  Battlements grant protection for archers, allowing the 
  defenders to take advantage of higher ground without fear of 
  reprisal. Rubble and planks of wood serve as weaker 
  protection. Hoardings provide greater protection from missile 
  weapons and enables defenders to move about unseen. 
  6.
  Many castles fall prey to invaders digging tunnels under the 
  walls. Extending the foundation is difﬁcult even with ample 
  warning, but a few stone blocks in easily compromised areas 
  thwarts quick access. Defenders can use cauldrons of water to 
  ﬁll tunnels and drown would-be intruders and set up traps to 
  protect obvious entry points. 
  7.
  Many siege engines are constructed primarily of wood; 
  arrows or ballistae bolts coated with pitch and set aﬂame are 
  useful agents of their destruction.  
  4
  
  8.
  Erecting redundant outer and inner walls of increasing height 
  allows the castle to absorb hits from siege engines, wears 
  down enemies scaling the walls and accelerates attrition of 
  enemy forces. 
  9.
  Both the besieging army and the castle’s defenders use 
  messenger birds to inform their leaders of events and to 
  request reinforcements or resupply. Archers on both sides 
  wait to shoot down the birds. Employing trained birds of prey 
  to attack smaller birds proves similarly useful. 
  10. Though risky, castle defenders can allow themselves to 
  become the enemy’s prisoners. While imprisoned, they can 
  gain intelligence on their enemy’s numbers and capabilities. 
  Escaping with that information, while not divulging 
  counterintelligence, is crucial for this tactic’s success. 
  11. A small band of defenders creeps out at night to dig small 
  holes along the attackers’ expected line of attack, in the 
  hopes of disrupting their charge. The group need guards, 
  and the characters are asked to accompany them. 
  12. The defenders have a small supply of enemy equipment and 
  uniforms. Volunteers are asked to join an intelligence-
  gathering sortie into the enemy camp. 
  5
  
  3: C HALLE N GE S & COM PLICATIONS 
  The defenders’ lot in a siege is a hard one. 
  DWINDLING SUPPLIES 
  When a castle is under prolonged siege, supplies will run low. Use 
  this list, to determine what shortages bedevil the defenders.  
  1.
  Iron & Coal: The castle’s blacksmith is hard at work repairing 
  the garrison’s arms and armour and forging new arrowheads, 
  crossbow bolt tips and the like. Unfortunately, this frenzy of 
  activity is eating into his stock of raw materials—iron bars, coal 
  and the like. (The castle’s bowyer/ﬂetcher, leather worker and 
  other essential crafter could also be in a similar situation).  
  2.
  Animal Fodder: Because the castle is under siege, more 
  beasts of burden and horses are stabled within its walls. 
  Sadly, supplies of animal fodder are running low and soon the 
  stablemaster must slaughter some of the animals. 
  3.
  Healing Supplies: A constant stream of wounded soldiers 
  and the like make their way to the castle’s healers—either 
  clerics, apothecaries or army surgeons. This constant demand 
  is depleting the healers’ supplies of bandages, unguents and 
  the like. Alternatively, the castle’s clerics could be running low 
  on consumable magic items such as potions and scrolls. 
  4.
  Wine & Ale: The castle is running low on wine and ale to 
  slake the defenders’ thirst. During particularly harrowing 
  times, the castle’s lord uses both drinks to boost the morale 
  and bravery of his soldiers. When the castle runs dry, a mutiny
  —or collapse in morale—could ensue. 
  5.
  Oil & Torches: A constant watch must be kept—particularly 
  during the hours of darkness when evil’s forces are at their 
  most dangerous. Such activity requires the expenditure of 
  much lamp oil and prepared torches for the castle’s human 
  defenders are at a disadvantage in the dark. 
  6.
  Firewood: The castle needs wood for its ﬁres to boil water, 
  cook food, light the blacksmith’s forge and for heat. Wood is 
  bulky, and the castle’s supply is running low. Will someone 
  slip over the wall to get more? (And if they do, how will they 
  retrieve a decent supply?) 
  7.
  Pigeons: The castle has a small supply of messenger pigeons, 
  but are running low as most have been despatched with 
  requests for reinforcements, more supplies and the like. Can 
  the characters sneak through the enemy lines to retrieve more 
  birds from a group of nearby scouts? 
  8.
  Masonry & Mortar: Enemy action has damaged parts of the 
  castle’s ramparts and crenellations. The castle’s supply of 
  masonry and mortar are running low as the stonemasons 
  patch up one piece of damage after another. (Alternatively, 
  the castle could be running low on planks and other prepared 
  wood as they use it to repair gates, hoardings and so  on). 
  9.
  Compassion & Caring: Surrounded and under constant 
  attack, the morale of the castle’s garrison and those seeking 
  shelter within, is falling. Arguments become more common, 
  and small ﬁghts erupt over trivial matters. Someone must 
  calm the situation before it spirals out of control. 
  10. Fresh Air: With so many bodies crammed into a small space, 
  and the reduction in sanitation, coupled with the 
  decomposing bodies of the dead and the ﬁres of the 
  besieging forces wafting over the castle, a miasma of death 
  hangs over fortress. Sickness and plague could result, unless 
  something is done.  
  LOW MORALE 
  Prolonged sieges take their toll on even the doughtiest warriors, 
  and ebbing morale can prove more dangerous than enemy 
  attacks. The castle’s lord or lady, or others in charge, must mitigate 
  the causes of hopelessness among the soldiers and deal with its 
  effects. Use this list, to determine the nature and level of the 
  despair faced by the defenders. 
  1.
  Several defenders wish to surrender. The castle’s lord or lady 
  must assuage their fears and inspire them to keep ﬁghting. 
  2.
  Tempers ﬂare among the castle’s guardians and ﬁghts break 
  out, with each side blaming the other for failures and losses 
  suffered during the siege. The situation requires a calming 
  inﬂuence to restore faith within the ranks. 
  3.
  Defenders sneak out of the castle at night to make a deal with 
  the besieging army, hoping to trade safety for intelligence on 
  the defences. The traitors have convinced themselves 
  everyone will die during the siege, so they hope to spare 
  themselves from certain doom. 
  4.
  Rumours about horrible treatment by the enemy spread 
  among the defenders. While this might seem to bolster 
  resolve among them, they instead suffer sleepless nights as 
  their imaginations run wild considering the torture awaiting 
  them should the castle fall. 
  5.
  The castle’s defenders believe the decisions made by their 
  leaders are lacking so they plan to overthrow them. 
  6.
  The defenders threaten to strike for better conditions or pay 
  for their work. Their threats intensify and their demands 
  become more unreasonable as the siege’s duration stretches 
  from days to weeks. 
  7.
  Rumours circulate among the castle’s inhabitants about a 
  supernatural enemy among the besiegers. This intensiﬁes the 
  inhabitants’ fear and degrades their ability to keep ﬁghting. 
  8.
  Members of the night watch feel taken advantage of, since 
  they must remain alert overnight while others beneﬁt from the 
  luxury of sleep. They become less attentive and more prone 
  to napping during their watch. 
  9.
  Low morale spreads to the ofﬁcers, who second guess their 
  decisions and poll their followers for advice on how to handle 
  the siege. This forces the followers to take matters into their 
  own hands or requires the lord or lady of the castle to replace 
  the ineffective leaders. 
  10. People begin to hoard food out of fear of dwindling supplies. 
  Arguments about food rationing become more frequent. In 
  extreme cases, someone poisons or purposely spoils the food 
  so no one can eat. 
  6
  
  OGL V1.0A 
  The following text is the property of Wizards of the Coast, Inc. and is Copyright 2000 Wizards of the Coast, Inc ("Wizards"). All Rights Reserved. 
   
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  System Reference Document: ©2000, Wizards of the Coast, Inc. Authors: Jonathan Tweet, Monte Cook, Skip Williams, based on material by E. Gary Gygax and Dave Arneson. 
   
  20 Things #57: Besieged Castle. ©Raging Swan Press 2021; Author: Creighton Broadhurst and Mike Welham. 
  To learn more about the Open Game License, visit wizards.com/d20. 
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  7
  
  R A G I N G S W A N P R E S S . C O M  
   EVERYTHING  
       is Better with  
  Tentacles 
  
   
   
   
   
   
   
   
   
   
   
   
   
  TITLE 
    
  
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