stalemate

A stalemate is a situation in which neither side is able to gain the advantage. This occurred very often in trench warfare during World War I. During a stalemate the two sides faced each other across an empty space called "no man's land." For months each side tried to reach the other's lines to push back the enemy. Usually, neither side was able to gain but a few miles but with a large amount of casualties.

Sources: Picture: http://www.worldwar1.com/foto/gb105.jpg Information: America Pathways To The Present text book pg. 417