Short answers, pulled from the story.
The British Second Army captured Hamburg on the 3rd of May 1945. General Alwin Wolz formally surrendered the city to Division HQ on that date after negotiations began on the 2nd of May.
General Alwin Wolz commanded the German defenders and drove under a white flag to negotiate with British troops. He received orders from Grand Admiral Karl Dönitz following the suicide of Adolf Hitler in Berlin.
The 7th Armoured Division, 53rd Welsh Infantry Division, and 1st Parachute Army units engaged German forces in northern Germany. The 11th Hussars entered the ruined city alongside the 7th Armoured Division on the afternoon of the 3rd of May 1945.
German high command in Berlin refused to send reinforcements as the Red Army besieged the capital while Adolf Hitler committed suicide. This refusal left scattered pockets of resistance across northern Germany including Bremen and Hamburg.
British tanks pushed back a counter-attack by the 12th SS Reinforcement Regiment resulting in seventy Germans becoming prisoners. Sixty Germans died during the fighting that occurred when Hitler Youth and sailors supported the assault with 88 mm guns.