How new technology canged warfare during world war 1

new technologies changed warfare because nobody ever had to face mustard gas or trench warfare before. the unknowing and harshness of these made mustard gas banned in war and the (in the best way i can put it) injury/illness of trench foot to make people loose there legs, until combat boots where created.

it was made because he wanted to try to make people convert as well people who would have read or studied this item at the time it was created were probably people who wanted to change religions who thought conversion was a good idea.