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A trench is a long, narrow ditch. It is like a valley, only on a very much smaller scale. It was used in World War I. It was supposed to be a short term barrier so that soldiers would be safe from enemy fire when they could no longer advance. However they ended up as a long term shelter throughout the war as they were easy to defend and neither side could successfully commandeer their oppositions trenches.
Trenches wer built as a temporary shield. if the armies had more time to prepare, they would have built something more permanent such as a castle
The following kinds exist:
- Military trench: Both sides of a conflict dig out trenches, they then shoot at each other from those trenches.
- Geological trench: For example the Mariana Trench
- Archaeological trench: When archaeologists do open excavation
The trench coat got its name from there.