corps with a total of six rifle divisions, plus artillery, armor and engineer reinforcements, took part in the attack. Assault 6 April 1945 In the southern sector of the front, the assault began at sunrise with heavy shelling, enduring three hours, trailed by the primary assault wave. The Soviet rifle divisions quickly went through the first defense line, because its defenders had been largely eliminated and the remainder were demoralized by several days of intense bombing. By noon, the Soviet leading regiments reached the second defensive line, where their progression was halted by stronger opposition, forcing Soviet commanders to use their reserve forces. Three hours later, the second defense line was overrun in several places. An especially bitter fight raged in the vicinity of Fort Eight. Built at the end of the 19th century and modernized since, the fort had thick walls, considerable firepower and was surrounded by a deep moat, making a frontal assault almost impossible. Despite heavy artillery fire, its defenders prevented any attempt to approach the walls. Only at dusk were Soviet forces able to reach the moat and start using explosives to try to breach the walls. In the main attack axis in the north, the attack started at the same time. By noon, the first defense line had fallen and the second line was badly shaken and broken in several places. In the afternoon, however, progress became increasingly slow, especially on the right flank, where German forces stationed in the western outskirts of the city (the so-called Samland Group) attempted several flanking attacks. Fort Five, claimed to be the best fortification of the entire Königsberg position, formed a strong resistance point. In front of such a situation, Soviet commanders decided to surround it and leave it behind, leaving the rear guard troops time to prepare a new assault. At dusk the battle stalled, allowing both sides to consolidate their lines, regroup their forces and bring reserves to the front line. This first day had mixed results, since Soviet progress was not as good as expected. However, both city defenses and the defenders' morale were seriously shaken, and troops, including officers, began to surrender periodically. During this first day of assault, bad weather prevented the Soviet troops from using precision bombing with as much effect as they would have liked. Additionally, even fortified, the terrain conquered by the Soviet troops during this day was not so