This one is really goodSorry for any formatting errors, I'm not used to this sort of forum software!
The general idea behind this is that the scientists of the Manhattan Project realise earlier that plutonium cannot be used for a gun-type nuclear weapon so they focus their efforts on Little Boy and Fat Man. This accelerates their development a bit and Little Boy is completed before the Germans surrender.
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The atomic bombing of Dresden took place on February 20th 1945. The primary purpose of the bombing was to demonstrate the power of the atomic bomb in the hope that it would convince the German government to surrender, or at least a large part of the Wehrmacht. The city of Dresden was chosen as it had yet to be subject to bombing from the Allies and was home to hundreds of factories and soldiers readying for deployment with Army Group Centre.
The bombing was initially planned to take place before the Yalta Conference, but had to be pushed back due to various delays and conflicts between American and British officials over the crewing of the aircraft. These disputes had been settled by the end of the Conference and it only remained for the planners to choose their target and their time. There was discussion of targeting Hamburg, but Dresden was selected over it due to its proximity to both Berlin and the advancing Russians. After favourable weather reports, the date was set for the twentieth of February.
The 'Joint Delivery Unit' was to be responsible for the delivery of the weapon. It was composed of two Avro Lancaster bombers ; one, crewed by specially-trained Americans, carried the bomb whilst the other, crewed by Britons, was responsible for monitoring and photographing the explosion and its after-effects. The JDU was embedded within a larger bomber force to give the outward appearance of a normal attack.
The Joint Delivery Unit left RAF Manston in Kent in the evening of the nineteenth and met up with the main bomber force over the English Channel. The attack force then proceeded to Leipzig where the JDU and twenty fighter escorts broke off and headed onward to Dresden. On the way, they were intercepted by seventeen Bf-109s but the escorts were able to distract them and the bombers went ahead alone.
The two planes reached Dresden at around quarter past three in the morning. The sky was clear and the weather calm and the mission commander, William Parsons, gave the go-ahead to drop the bomb. It exploded 1,200 ft above Dresden Castle with a yield equivalent to 18 kilotons of TNT. Around 120,000 people were killed instantly or in the first few hours after the attack, many of them were refugees who had fled westwards to escape the Soviet advance. In the following days and weeks and months, it is estimated that between 100,000 and 200,000 more people succumbed to injuries sustained during the blast or from exposure to radiation; the exact number is uncertain due to lack of records .
Whilst the bomb succeeded in levelling most of Dresden, it failed in its purpose to coerce the Germans into surrendering. Instead, the resolve of the Nazi leadership hardened. With the taboo on weapons of mass destruction having been broken, the Germans deployed chemical weapons on the Eastern Front, and in a limited capacity on the Western Front, to buy themselves more time to develop their own 'wonder weapons' . The United Nations pressed on regardless and Berlin was captured on the 2nd of June 1945 after a joint Soviet-American offensive.
The atomic bombing of Dresden remains the most controversial act of the Second World War, alongside the atomic bombing of Kyoto, with questions raised over the necessity of deploying nuclear weapons and the military value of Dresden as a target. For many Germans, it served to convince them of the truth of Goebbels' propaganda which cast the Allies as brutal murderers. Many acts of sabotage and terrorism committed by guerilla 'Werewolf' units after the war were said to be in retribution for the bombing, including the assassination of General Eisenhower in 1947. To this day, “Remember Dresden!” remains a rallying cry for the far-right in the German states .
 Although they had already modified the B-29, I thought it would make sense to use a Lancaster as they were flying from Britain.
 This is a bit of an educated guess based on the casualties from Hiroshima IOTL.
 The Allies did not respond in kind. There were no more bombs ready and Churchill was persuaded that a genocidal anthrax attack would not be in Allies' best interests.
 We have everyone's favourite Secretary of the Treasury to thank for that plural.