TEXT: Weapon &
  Shield
  One Handed
  Weapon Used with 
  Two Hands
  Two Handed
  Weapon Only
  2 One Handed 
  Weapons, Attacking 
  with Both
  One Handed
  Weapon Only
  2 One Handed 
  Weapons, Defending 
  with Second
  Shield Only
  Jab
  2 Shields Only
  Hold at
  Bay
  Overview of
  Unarmed Combat
  Aggressive
  Attack
  Charge
  Fight
  Defensively
  Tactical
  Move
  Full
  Parry
  Ready Against
  Charge
  Give
  Ground
  Scampter
  Back
  Strike
  Fighting
  Withdrawal
  Overbear
  Bull Rush
  Tackle
  Hold
  Toss /
  Take Down
  Break
  Hold
  Grab
  Lift / Lift
  and Toss
  Scramble for
  Weapon
  Mitigating
  Surprise
  Spell
  Fatigue
  Turning
  Undead
  Combat Styles
  Special Combat Moves
  Unarmed Combat
  Misc
  Flee
  Shield
  Bash
  UNARMED COMBAT - SHIELD BASH  
   
  Shield bashing is actually an attempt to injure an opponent by hitting him with your 
  shield. Damage varies by shield size, plus Strength bonus, any shield bonuses due to 
  magic or workmanship and any modifiers due to unarmed combat specialization. No 
  Special Results Sum is required; a successful hit indicates the specified damage. 
  Regardless of the result, a shield bash always does at least 1 point of damage as it is 
  effectively an attack with a weapon. 
   
  Shield Bash                 Base Damage 
  --------------------------------------------------- 
  Buckler                                 0* 
  Small or Medium       (d4p-2)+(d4p-2) 
  Large or Body            (d4p-1)+(d4p-1) 
   
  *bucklers cannot shield bash, but can be used as an improvised weapon for d3p, having 
  the Shield proficiency grants one proficiency with this “weapon”, non-proficiency 
  penalties are irrelevant as not having the shield proficiency bars one from making use 
  the the shield regardless
  
SOURCE: textdata/thevault/Hackmaster/5th Edition/Misc/Combat Cheat Sheet.pdf