Answer:
Trenches were long, narrow ditches dug into the ground where soldiers lived. They were very muddy, uncomfortable and the toilets overflowed. These conditions caused some soldiers to develop medical problems such as trench foot. There were many lines of German trenches on one side and many lines of Allied trenches on the other. In the middle was no man's land, which soldiers crossed to attack the other side.
A typical day in the trenches .
5am 'Stand-to' (short for 'Stand-to-Arms', meaning to be on high-alert for enemy attack) half an hour before daylight
5.30am Rum ration
6am Stand-down half an hour after daylight
7am Breakfast (usually bacon and tea)
After 8am Clean selves and weapons, tidy trench
Noon Dinner After dinner Sleep and downtime
5pm Tea
6pm Stand-to half an hour before dusk
6.30pm Stand-down half an hour after dusk
6.30pm onwards Work all night with some time for rest (patrols, digging trenches, putting up barbed wire, getting stores)