Why do you think artillery became such a major part of trench warfare?

Artillery was a game changer in trench warfare. The right equipment could easily destroy enemy trenches, and even take out opposing artillery as well.

The trenches keep soldiers sheltered from small arms fire and artillery. - Trench warfare is a form of attrition warfare ... - Because attacking an entrenched enemy was so difficult, tunneling underneath enemy lines became on of the major efforts during the war.