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Why was trench warfare introduced in WW1? - World War 1: Video playlist - BBC Bitesize
Historian Dan Snow shows why trenches were needed in WW1.
↗ https://www.bbc.co.uk/bitesize/topics/ztqtb9q/watch/z8bdq6fHistorian Dan Snow shows why trenches were needed in WW1.
↗ https://www.bbc.co.uk/bitesize/topics/ztqtb9q/watch/z8bdq6f