Billingslea led his regiment during the Battle of the Bulge and during the advance to the Rhine in January–February 1945. He distinguished himself again on February 2, 1945 during combat on the Siegfried Line, when he fearlessly exposed himself to intense enemy small arms, mortar, and artillery fire to direct his command's assault against Siegfried Line fortifications. When elements of his regiment were pinned to the ground by fierce crossfire, he advanced to the area and personally directed his command in thwarting the hostile thrust. During a second vicious counterattack, he proceeded to his reserve battalion, directed the commitment of his reserves and repulsed the counter-attack. Billingslea was subsequently decorated with a second Distinguished Service Cross.