Yugoslavian troops were forced to withdraw to southern Macedonia when the Germans captured Skopje, exposing their flank. German 2nd Panzer Division had reached Strumica, Yugoslavia by the end of the day, which was only 10 miles from the Greek border, from which point it would be able to bypass the Metaxas Line defenses, where German troops conducted a failed frontal assault on this day. The United Kingdom promised aid to Yugoslavia and broke off relations with Hungary; meanwhile, RAF bombers conducted a raid on Sofia, Bulgaria
