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2. trench warfare-a type of armed combat in which the opposing troops fight from trenches that face each other; instead of the war ending quickly, it became bogged down in trench warfare. armed combat, combat-an engagement fought between two military forces. Translations.
Much of the war along the western front was fought using trench warfare. Both sides dug long lines of trenches that helped to protect the soldiers from gunfire and artillery. The area between enemy trenches was called No Man's Land. Trench warfare caused a stalemate between the two sides for many years.