The Trenches:
Dug in to house men before the decisive battle. But they were stalemated and the trenches were around for years. German trenches were up to 12 metres deep and used concrete to reinforce. British were never as good - they preferred to be offensive and didn't expect the trench warfare to last as long as it did. Trenches became complex with deferent compartments - sleeping chambers, ammunition storage... offices trenches were much better than soldiers. Trenches could stretch back kilometers. There were reserve trenches behind the front-line.
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