The occupation of France imposed a garrison burden on Germany, yet the defeat remained strategically costly for Britain. French territory offered closer bases for twin-engined bombers and Atlantic submarines while removing an allied army, fleet, and industrial partner. Dunkirk saved personnel but left large quantities of equipment behind. The uncertain future of French warships also produced the crisis at Mers-el-Kébir, converting former allied assets into risks that Britain had to manage.
Chapter · 36:59-38:13
France's defeat opened Atlantic bases and cost Allied matériel
Occupation tied down German troops but also supplied nearer bomber and submarine bases while stripping Britain of an ally and equipment.