 In the south, Chuikov's 8th Guards Army and Katukov's 1st Guards Tank Army crossed the Landwehr Canal on 27 April, the last major obstacle between them and the "Führerbunker" next to the Reich Chancellery less than away.In the south-east, Berzarin's 5th Shock Army had bypassed the Friedrichshain "flak" tower and was now between Frankfurter Allee and the south bank of the Spree, where its IX Corps was fighting.By 27 April the Soviet Armies had penetrated the German's "S-Bahn" outer defensive ring from all directions.