The "pocket" of La Rochelle ("Poche de La Rochelle") was a zone extending to a distance of about 10 kilometers around La Rochelle, reinforced by an anti-tank trench. After the allied landing in Normandy in June 1944, a large number of German troops had regrouped in the area. Agreements were made between the French and the German occupation force in La Rochelle, to the effect that the French would not attack and that in exchange the Germans would not destroy the port installations of La Rochelle-La Pallice.