On 20 April, his 56thbirthday, Hitler made his last trip from the (Führer's shelter) to the surface. In the ruined garden of the Reich Chancellery, he awarded Iron Crosses to boy soldiers of the Hitler Youth, who were now fighting the Red Army at the front near Berlin. By 21 April, Georgy Zhukov's 1st Belorussian Front had broken through the defences of General Gotthard Heinrici's Army Group Vistula during the Battle of the Seelow Heights and advanced to the outskirts of Berlin. In denial about the dire situation, Hitler placed his hopes on the undermanned and under-equipped (Army Detachment Steiner), commanded by Felix Steiner. Hitler ordered Steiner to attack the northern flank of the salient, while the German Ninth Army was ordered to attack northward in a pincer attack.