By 10:00 the soldiers of the 150th had reached the moat, but accurate fire from 12.8 cm FlaK 40 anti-aircraft guns, two kilometres away high on the flak tower in the Berlin Zoo, prevented any further successful advance across the moat during daylight. Throughout the rest of the day, as ninety artillery pieces, some as large as the 203 mm howitzer, as well as Katyusha rocket launchers, bombarded the Reichstag and its defensive trenches. Colonel Negoda's 171st Rifle Division, on the left flank of the 150th, continued to capture the buildings of the diplomatic quarter to the north of Königsplatz.[68][69]