 Lacking artillery, the men had to clear it room by room with grenades and sub-machine guns.In the south-east at dawn on 29 April, Colonel Antonov's 301st Rifle Division pressed on with its assault.After very heavy fighting, the formation managed to capture the Gestapo headquarters on Prinz-Albrecht-Strasse, but a "Waffen SS" counter-attack forced the regiments of the division to withdraw from the structure.