Hitler transferred his headquarters to the Führerbunker ("Leader's bunker") in Berlin on 16 January 1945, where he (along with Bormann, his secretary Else Krüger, and others) remained until the end of April.
In 1944, Planck's son Erwin was arrested by the Gestapo following the attempted assassination of Hitler in the 20 July plot. He was tried and sentenced to death by the People's Court in October 1944. Erwin was hanged at Berlin's Plötzensee Prison in January 1945. The death of his son destroyed much of Planck's will to live.
The Allied advance from Paris to the Rhine (25 August 1944–7 March 1945), also known as the Siegfried Line campaign, was a phase in the Western European campaign of the World War.
On 20 April, Hitler's 56th birthday, he made his last trip to the surface. In the ruined garden of the Reich Chancellery, he awarded Iron Crosses to boy soldiers of the Hitler Youth. That afternoon, Berlin was bombarded by Soviet artillery for the first time.
By 21 April, Georgy Zhukov's 1st Belorussian Front had broken through the defenses of General Gotthard Heinrici's Army Group Vistula during the Battle of the Seelow Heights and advanced to the outskirts of Berlin.
Göring sent a telegram from Berchtesgaden, arguing that since Hitler was isolated in Berlin, Göring should assume leadership of Germany. Göring set a deadline, after which he would consider Hitler incapacitated. Hitler responded by having Göring arrested, and in his last will and testament of 29 April, he removed Göring from all government positions.
In the early morning hours of 29 April 1945, Wilhelm Burgdorf, Goebbels, Hans Krebs, and Bormann witnessed and signed Hitler's last will and testament. Bormann was named executor of the estate. That same night, Hitler married Eva Braun in a civil ceremony.
Soviet and Polish forces stormed and captured Berlin in late April. In Italy, German forces surrendered on 29 April. On 30 April, the Reichstag was captured, signaling the military defeat of Nazi Germany, Berlin garrison surrendered on 2 May.
In accordance with Hitler's last wishes, Bormann was named as Party Minister, thus officially confirming his top position in the Party. Grand Admiral Karl Dönitz was appointed as the new Reichspräsident (President of Germany) and Goebbels became head of government and Chancellor of Germany. Goebbels and his wife Magda committed suicide later that day.
As Soviet forces continued to fight their way into the centre of Berlin, Hitler and Braun committed suicide on the afternoon of 30 April. Braun took cyanide and Hitler shot himself. Pursuant to Hitler's instructions, their bodies were carried up to the Reich Chancellery garden and burned.
On 2 May, the Battle in Berlin ended when General der Artillerie Helmuth Weidling, the commander of the Berlin Defense Area, unconditionally surrendered the city to General Vasily Chuikov, the commander of the Soviet 8th Guards Army.
Bormann's group left the Führerbunker and travelled on foot via a U-Bahn tunnel to the Friedrichstraße station, where they surfaced. Several members of the party attempted to cross the Spree River at the Weidendammer Bridge while crouching behind a Tiger tank. The tank was hit by Soviet artillery and destroyed, and Bormann and Stumpfegger were knocked to the ground. Bormann, Stumpfegger, and several others eventually crossed the river on their third attempt. Bormann, Stumpfegger, and Axmann walked along the railway tracks to Lehrter station, where Axmann decided to leave the others and go in the opposite direction. When he encountered a Red Army patrol, Axmann doubled back. He saw two bodies, which he later identified as Bormann and Stumpfegger, on a bridge near the railway switching yard. He did not have time to check thoroughly, so he did not know how they died. Since the Soviets never admitted to finding Bormann's body, his fate remained in doubt for many years.
On 11 July, Allied leaders met in Potsdam, Germany. They confirmed earlier agreements about Germany, and the American, British, and Chinese governments reiterated the demand for the unconditional surrender of Japan, specifically stating that "the alternative for Japan is prompt and utter destruction". During this conference, the United Kingdom held its general election, and Clement Attlee replaced Churchill as Prime Minister.
At the Potsdam Conference in July 1945, the Combined Chiefs of Staff decided that Indochina south of latitude 16° north was to be included in the Southeast Asia Command under British Admiral Mountbatten. Japanese forces located south of that line surrendered to him and those to the north surrendered to Generalissimo Chiang Kai-shek.
On July 26, 1945, the Allies issued the Potsdam Declaration demanding unconditional surrender. The Japanese government council, the Big Six, considered that option and recommended to the Emperor that it be accepted only if one to four conditions were agreed upon, including a guarantee of the Emperor's continued position in Japanese society. The Emperor decided not to surrender.
The trial got underway on 20 November 1945. Lacking evidence confirming Bormann's death, the International Military Tribunal tried him in absentia, as permitted under article 12 of their charter. He was charged with three counts: conspiracy to wage a war of aggression, war crimes, and crimes against humanity.