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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.
The area between opposing trench lines (known as no man's land) was fully exposed to artillery fire from both sides. Attacks, even if successful, often sustained severe casualties. With the development of armoured warfare, emphasis on trench warfare has declined, but still occurs where battle-lines become static.