Why did the Germans and the French use trenches during the war?

Long, narrow trenches dug into the ground at the front, usually by the infantry soldiers who would occupy them for weeks at a time, were designed to protect World War I troops from machine-gun fire and artillery attack from the air. Trenches may have afforded some protection by allowing soldiers more time to take other defensive steps, such as putting on gas masks

They used trenches to stay ducked and covered and to protect soldiers from poisonous gas and gunshots

Explanation:

the following best describes postwar era writers in their works:

many writers,authors,novelists,poets concentrated more on social art and social writing and stayed away from political writings.