At the beginning of World War I, the uniform..........all the soldiers were wearing metal helmets instead of cloth caps?

Question

At the beginning of World War I, the uniform of the British soldiers included a brown cloth cap. As the war went on, the British officials became more and more concerned about the growing number of soldiers suffering from head injuries. They decided to replace the cloth cap with a metal helmet. However, to their surprise, the number of soldiers with head injuries grew even more, although the intensity of the battles was the same before and after the change. So why did the number of head injuries per battalion increase even though all the soldiers were wearing metal helmets instead of cloth caps?

Answer 1

Answer:
The answer is supposed to be simple, but all of your ideas are valid.
When soldiers wore cloth helmets any round fired at their head had a very good chance of penetrating the cloth helmet with enough force to kill said unlucky soldier. When they switched to armored helmets, said rounds were slowed or deflected resulting in injuries, but not deaths.

In other words, the same amount of people were being shot in the head, but more of them were only wounded, thus increasing the number of head injuries.
No idea if its true, but that’s the answer you’re supposed to come up with.