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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.
British troops in a trench on the Western Front during World War I.EncyclopÃ¦dia Britannica, Inc. The typical trench system in World War I consisted of a series of two, three, four, or more trench lines running parallel to each other and being at least 1 mile (1.6 km) in depth.