Trench warfare caused the immobilization of troops on the

western front.
middle eastern desert.
eastern front.
mountains in russia.

Trench warfare caused the immobilization of troops on the: a. western front.
trench warfare is a land warefare using for fighting lines, which is the troops are protected and substantially sheltered from artilery.

hope this help

Since wxyz is 4, halfof that would be 2.

Answerland;