Trench warfare

Definition: a struggle (usually prolonged) between competing entities in which neither side is able to win; "the hope that his superior campaigning skills would make a difference evaporated in the realization that electioneering had become a form of trench warfare"

Definition: 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"

Definition: Warfare in which opposing sides occupy trenches and repeatedly fire at one another; usually involving high casualty rates over a long period of time.