The HQ Map is a historical item that can be found by Freddie during the Battle of Marne in Chapter 1. 


When climbing down the ladder from the bridge to set the dynamite, the item is hidden behind the reeds to the right.


"Soldiers did not have sat-nav to pick their way through the countryside. The only tools they had were a compass and a HQ map. Orienteering duties were the reserve of officers and non-commissioned officers."

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