[1] He would return to his nation's service for World War II, being killed on 6 June 1940 during the Fall of France.

[3][4] The Staffel moved to Flanders for operations against the British in June 1917, and between 11 August and 8 November, Quandt was credited with six more aircraft shot down.

[1] On 21 August 1918, Quandt returned to Jasta 36, replacing Harry von Bülow-Bothkamp as commanding officer.

[1][7] In 1936, Quandt joined the Luftwaffe as a reserve officer, and on the outbreak of World War II, was called up to active service, joining Jagdgeschwader 20 (JG 20), and was promoted to Major later that month, before transferring to JG 3.

Quandt was shot down and killed in action on 6 June 1940 while flying a Messerschmitt Bf 109 during the Battle of France, his aircraft crashing near Envermeu, east of Dieppe.