French Resistance played a major role in the fighting. As the Allies advanced into France, the Resistance evolved from a guerilla fighting force to a semiorganized army called French Forces of the Interior (FFI). The FFI would tie down German troops by sabotaging bridges and communication lines, seizing important traffic hubs and directly attacking isolated German forces. They were aided by Allied special forces from the Office of Strategic Services (OSS), who would supply the Allies with vital intelligence. The Allied ground and naval forces were supported by a large aerial fleet of 3470 planes. The majority of them were stationed on Corsica and Sardinia. The tactical bombers and fighters had to support the landings directly, while the strategic element had to bomb German targets deep into France. The strategic bombing started well before the landing, and targeted airports, traffic hubs, railroads, coastal defenses, and communication lines. Opposing the Allies was the German Army Group G (HeeresgruppeG). Although nominally an army group, Army Group G had at the time of the invasion only one army under its command: the 19th Army, led by Friedrich Wiese. As southern France had never been important to German planning, their forces there had been stripped of nearly all their valuable units and equipment over the course of the war. Due to the Allied threat in Normandy, Army Group G's units were continuously sent north until the Dragoon landings. The remaining 11 divisions were understrength and only one panzer division was left, the 11th. In early August, the 11th Panzer Division had sent one of its two panzer battalions to Normandy shortly before the landing. The troops were positioned thinly along the French coast, with an average of per division. Generally, the troops of the German divisions were only second- and third-rate. This meant that over the course of the war, the divisions were thinned out and soldiers were replaced with wounded old veterans and Volksdeutsche from Poland and Czechoslovakia. Numerous units were also replaced by Ostlegionen and Ostbataillone. These units were volunteers from Eastern Europe, mainly the Soviet Union, and had a generally low fighting morale. The equipment of those troops was in poor shape, consisting of old weapons from various nations, with French, Polish, Soviet, Italian and Czech guns, artillery, and mortars. Four of the German divisions were designated as "static", which meant that they were stripped of all of their mobile capabilities