On D-Day the 405th patrolled the beachhead. attacking railroads, trains, vehicles. gun emplacements and other targets. Soon after the invasion, the squadron moved to France and participated in the air interdiction that preceded the Allied breakout at St Lo in late July and supported the following drive across northern France. It continued to operate in northeastern France and southwestern Germany through the winter of 1945, attacking storage dumps, marshalling yard, factories, bridges, roads, and vehicles. In December 1944 it provided close air support for ground forces engaged in the Battle of the Bulge.