In constructing their trenches, the Allies and Germans had different systems of thought. The former thought that the war would be over soon and that the soldiers would not spend much time in the trenches, resulting in poorly constructed ones that weren't comfortable by any means. The Germans, on the other hand, took into account the construction of their trenches, resulting in sturdy defensive lines.
They were more of an asset to the Germans than to the Allies
Explanation:
Trench warfare or war of position is a form of warfare, in which the fighting armies maintain static lines of fortifications dug in the ground, called trenches. Trench warfare arose from a revolution in firearms. There were periods of trench warfare in the Civil War (1861-1865) and the Russo-Japanese War of 1904-1905, but it reached its peak of brutality and mortality on the Western Front of the First World War. They reached a depth of between one and two meters, and connected with others for greater mobility of the battle blocks.