Glossarytrenches
a long, narrow hole that is dug in the ground
The army men sat in the trench to hide from the gunshots.
https://www.google.com/search?q=trench&es_sm=119&source=lnms&tbm=isch&sa=X&ei=lipjU9bbB461yASVxIKYDw&ved=0CAgQ_AUoAQ&biw=1256&bih=590#facrc=_&imgdii=_&imgrc=0EHNeGHwqV7UlM%253A%3B13_i69qTBmDoZM%3Bhttp%253A%252F%252Fwww.1914.org%252Fwp-content%252Fuploads%252F2012%252F05%252Fq-962-H.M-the-King-watching-a-practice-trench-attack-by-Australian-troops-at-the-Fifth-Australian-School-near-Sailly-14th-August-1916.jpg%3Bhttp%253A%252F%252Fwww.1914.org%252Fpodcasts%252Fpodcast-15-trench-raids%252F%3B640%3B439