The twelfth century, a famous knight of England, William Marshal. A knight in the Tournament, he won, but in presenting the award, we can not find him. Later, people found in a blacksmith's forge him: his helmet was knocked in the game, so he is head on the anvil, the blacksmith with a hammer to knock off the helmet - it does not hurt the Knights and was taken the only way under the helmet. Suffer in the hot day battle is: Sun Zhishai the helmets, they can not wipe his hand. Were inaudible outside the armor came orders and messages, also can not say the words to make people understand. Worse, once the helmet has been he missed, with a helmet of person who could not see anything. There are a lot of history because the armor in the hot heat stroke death of instances, there are many drowned - although they are often drowned just a small stream. In Agincourt campaign, many of the French knights fell were trampled in the mud too pulpy way, the results are alive suffocated. This helmet also brings a problem: just look at a helmet could not identify who was who. Therefore knights in helmets and shields painted on a variety of markers - the coat of arms on the origin of this later.