It fired bolts capable of piercing enemy shields and armour. They wore elk hide tunics under their armour and wooden helmets. These wore leather armour or mail plus a helmet. They were mostly used during infantry training for posing as the enemy armour. The Jurchens had a reputation for making high quality armour and weapons. The armoured belt consisted of face-hardened Krupp cemented armour (KC), arranged in three strakes. One example of a mace capable of penetrating armour is the flanged mace. All soldiers had their serviceable equipment including their body armour and boots taken from them. See also headgear listing within Components of medieval armour. Battleships sacrificed speed for armour and heavy naval guns ( or larger). Gavin, a tank operator who had washed out of U.S. Army Armour tank operations training. In heavy fighting during the day the British armour made little further progress. Such modules are also used by tanks not equipped with Chobham armour. Cobra helicopter gunships were employed against Syrian armour and fortifications. These tanks started to be used in different roles based on armour and mobility.