Key term for OCR GCSE History A, used in War and British Society c.790–2010.
A military strategy where a network of fortifications slows down an invader, preventing them from living off the land or moving freely.
Defense in depth appears in OCR GCSE History A revision content for British Thematic Studies, especially War and British Society c.790–2010 and War c.790–c.1500.
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