1) Battle shelter 2) Battlefield shelter 3) Bunker 4) Dugout 5) Fox hole 6) Front place 7) Pit for a soldier 8) Refuge of a kind 9) Saving Private Ryan setting 10) Virtual economy 11) Wartime depression 1) Bunker 2) Dugout 3) Haven 
A small hole dug by an infantry soldier in which they slept and protected them selves from attack.
fighting hole as termed by the Army and Marines of the past, no longer appropriate for Marine use.
[n] - a small dugout with a pit for individual shelter against enemy fire
fox hole noun a small dugout with a pit for individual shelter against enemy fire
a small pit, usually for one or two soldiers, dug as a shelter in a battle area.