From the platoon sergeant or first lieutenant trying to work out what was on the other side of the hill to the generals and field marshals planning grand strategy, the second world war was fought using maps. But how good were these maps? How were those covering under-explored areas made and how quickly could they be supplied to the men on the move at the sharp end?

In this podcast, Professor Jeremy Black, author of A History of the Second World War in 100 Maps, talks to The Critic‘s political editor, Graham Stewart, about a vital factor in wartime production that military history often overlooks.

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