Heinrich Füllgrabe (26 July 1916 – 30 January 1945) was a Luftwaffe ace and recipient of the Knight's Cross of the Iron Cross during World War II. The Knight's Cross of the Iron Cross was awarded to recognise extreme battlefield bravery or successful military leadership. After joining the Luftwaffe in the late 1930s, after his training as a fighter pilot, Füllgrabe was appointed to serve as the Unteroffizier 9./JG 52 in spring 1941. Füllgrabe became a member of one of the most efficient units of the Luftwaffe, Karaya Quartet, where he flew alongside Hermann Graf (212 kills), Alfred Grislawski (133) and Ernst Süß (68). Füllgrabe was killed on 30 January 1945 by Soviet anti-aircraft fire near Brieg in Silesia. During his career he was credited with 67 aerial victories, all of them on the Eastern Front, including five Il-2 Sturmoviks. Early life and career Füllgrabe was born on 26 July 1916 in Witzenhausen in Hesse-Nassau, a province of the Kingdom of Prussia within the German Empire. Füllgrabe joined the military service of the Luftwaffe, initially serving as a mechanic with I. Gruppe (1st group) of Jagdgeschwader 234 (JG 234–234th Fighter Wing), which later became the I. Gruppe of Jagdgeschwader 26 "Schlageter" (JG 26–26th Fighter Wing). He was trained as a fighter pilot at the Jagdfliegerschule, the fighter pilot school at Stolp-Reitz. In June 1940, Füllgrabe was posted to 2. Staffel (2nd squadron) of Ergänzungs-Jagdgruppe Merseburg, a supplementary training unit based at Merseburg. In Merseburg, he befriended Hermann Graf and Alfred Grislawski, with whom he would later spend much of his combat career. In early 1941, he was posted to 9. Staffel of Jagdgeschwader 52 (JG 52—52nd Fighter Wing), a squadron of III. Gruppe. World War II World War II in Europe had begun on Friday 1 September 1939 when German forces invaded Poland. At the time of Füllgrabel's posting to 9. Staffel, the Gruppe was commanded by Major Gotthard Handrick. The rise of General Ion Antonescu in Romania in 1940 led to a reorganization of his country's armed forces. In this, he was supported by a military mission from Germany, the Luftwaffenmission Rumänien (Luftwaffe Mission Romania) under the command of Generalleutnant (equivalent to major general) Wilhelm Speidel. III. Gruppe of JG 52 was transferred to Bucharest in mid-October and temporarily renamed I. Gruppe of Jagdgeschwader 28 (JG 28—28th Fighter Wing) until 4 January 1941. Its primary task was to train