the bolt-action rifle. 15 rounds could be fired in a minute and a person 1,400 metres away could be killed. Machine guns needed 4-6 men to work them and had to be on a flat surface. They had the fire-power of 100 guns. large feild guns had a long range and could deliver devastating blows to the enemy but needed up to 12 men to work them. They fired shells which exploded on impact. Chlorine gas causes a burning sensation in the throat and chest pains. Death is painful - you suffocate!