What is Trench?
{{unsourced|date=August 2009}} [[File:6thbritairbornenormandytrench.jpg|thumb|Soldiers digging a trench as cover]] [[File:Polyethylene gas main.jpg|thumb|upright|Gas pipe being laid in a trench]] A '''trench''' is a long, narrow [[ditch]]. [[Trench warfare]] has often been used in defense. Entrenched soldiers can be somewhat safe from enemy fire. Trench warfare made [[World War I]] longer than expected. The [[trench coat]] got its name from there. Several kinds of trench exist: * ''Utility trench'' has pipes, wires, or other [[infrastructure]] * ''Road trench'' carries [[vehicles]] * ''Military trench'' provides shelter for [[soldier]]s shooting at each other * ''[[Oceanic trench]]'': For example, the [[Mariana Trench]] *''[[Rift valley]]'' * ''Archaeological trench'' dug by [[archaeologist]]s [[Category:Landforms]] [[Category:War]]