What pests did the soldiers encounter in the trenches?

Soldiers in the trenches during World War I faced numerous pests, including lice, rats, and flies. Lice thrived in the unsanitary conditions, causing discomfort and spreading disease, while rats were attracted to the food supplies and the remains of fallen soldiers. Flies proliferated in the damp environment, contributing to the unhygienic conditions. These pests not only caused physical irritation but also posed significant health risks to the soldiers.