it was 80 metres behind the frontline trench and troops would retreat there if the frontline came under attack
what were dugouts?
holes dug into the sides of trenches where men could take protective cover
what was the reserve trench?
it was at least 100 metres behind the support trench and was where reserve troops could be mobilised for a counter-attack if the frontline trench was captured by the enemy
what were communication trenches?
they ran between the other trenches
trenches were 2-2.5 metres deep and were protected and reinforced by sandbags
messengers ran along the communication trench to pass on important information
