On the Eastern Front, the 503rd Infantry Regiment was involved in the defensive battle of Nevel. In this sector, Johannmeyer distinguished himself with notable action during the fighting in March 1943, and was awarded the 329th Oak Leaves to the Knight's Cross on 18 November 1943. On 25 November, his battalion attacked Soviet positions near the town of Sergeytsevo with the aid of the 502nd Heavy Tank Battalion in a forest. Otto Carius, a Tiger I tank commander of the battalion, recalled in his memoirs that Johannmeyer was struck by sniper fire in the lungs from a Soviet marksman hidden in tree foliage. Initially, Johannmeyer was thought to have a limited chance of survival, but he managed to survive. Carius wrote 'he was relieved to hear from Johannmeyer while he was in hospital in 1944'. Johannmeyer was absent from his official Oak Leaves award ceremony as his condition was still considered critical. Shortly thereafter, on 1 December, Johamnmeyer was promoted to the rank of major. On 1 March 1944, Johannmeyer was called to a training course for senior officer adjutants, and 3 months later was transferred to the OKH. From August 1944 onwards, he served in the Army Personnel department, with the rank of Oberstleutnant i.G..
Hitler's Adjutant
In 1945, Johannmeyer was transferred to the Führerhauptquartier in Berlin, located at the time in the Reich Chancellery, as Army Adjutant, replacing Heinrich Borgmann. Johannmeyer was present at the conferences held twice a day in the Chancellery's greenhouse, and later at those held in the Führerbunker. On Hitler's order, Johannmeyer flew to East Prussia to "clarify" the situation developing as the Soviets advanced through the Baltic States. Hitler always considered reports by army generals unrealistic, and refusing to accept that the Eastern Front was collapsing, relied on his adjutants to relay "positive news". Johannmeyer, upon his return, reported that the army was in an alarmingly desperate state, especially after the formation of the Courland pocket and the pocket around Königsberg. Hitler refused to allow any means of withdrawal. When Johannmeyer referred to the civilian deaths occurring due to the massive evacuation of the eastern territories, Hitler replied in anger: Johannmeyer was among the occupants of the Führerbunker, Hitler's underground headquarters in encircled Berlin. Johannmeyer was present at Hitler's last birthday ceremony on 20 April 1945. During the night of the 28–29 April, Hitler ordered three copies of his political testament be hand-delivered to Field MarshalFerdinand Schörner in Czechoslovakia, Karl Dönitz in Schleswig-Holstein, and Paul Giesler in Tegernsee by Johannmeyer, SS-StandartenführerWilhelm Zander - Bormann's adjutant, and Chief Press Secretary Heinz Lorenz, respectively. The three officers said their farewell to Hitler and were each handed a white dossier containing the testament by Martin Bormann at approximately 4:00 am on 29 April. Armed with automatic weapons, and in uniform, the trio left Berlin later that day attempting to break through Soviet lines to deliver the testament to their respective objective. Oberstleutnant Graßmann was tasked with ferrying Johannmeyer in a Fieseler Fi 156 Storch from Pfaueninsel, Wannsee, back to Field Marshal Schörner's headquarters - who at this time was still unaware of his appointment as Commander-in-Chief of the Army. He took off at around midnight on 1–2 May 1945, but was unable to land in Berlin, having to return and make an emergency landing in the Erzgebirge.
Post-war life
Johannmeyer was arrested by American troops in 1945. After his release, he was engaged in industrial business, mainly in Agricultural Economics, and attained the diploma - Dipl. agr. He worked for the DEMAG subsidiary FMA Pokorny in Frankfurt am Main, Hessen, and became a member of the company's board of directors. Johannmeyer died on 14 April 1970.
