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Why was trench warfare introduced in WW1? - Era of the Great War: Video playlist - BBC Bitesize
Historian Dan Snow shows why trenches were needed in WW1.
↗ https://www.bbc.co.uk/bitesize/topics/zygwhyc/watch/ztjq2hvHistorian Dan Snow shows why trenches were needed in WW1.
↗ https://www.bbc.co.uk/bitesize/topics/zygwhyc/watch/ztjq2hv