World War 1 trenches were dirty, smelly and riddled with disease. For soldiers life in the trenches meant living in fear. In fear of diseases (like cholera and trench foot) and of course, the constant fear of enemy attack.
Soldiers in the Western Front were very critical of the quantity and the quality of food they received. The bulk of their diet in the trenches was bully beef (caned corned beef), bread and biscuits. By the winter of 1916 flour was in such short supply that bread was being made with dried ground turnips.
Two British soldiers standing in a flooded communication trench during WW1. It is estimated that there were about 2,490km of trench lines dug during World War 1. Most trenches were between 1-2 metres wide and 3 metres deep.
Soldiers also made dugouts and funk holes in the side of the trenches to give them some protection from the weather and enemy fire. The front-line trenches were also protected by barbed-wire entanglements and machine-gun posts. Short trenches called saps were dug from the front-trench into No-Man's Land.
Trench warfare is a form of land warfare using occupied fighting lines consisting largely of trenches, in which troops are significantly protected from the enemy's small arms fire and are substantially sheltered from artillery. The most prominent case of trench warfare is the Western Front in World War I.