[1] Following the 1939 aerial Battle of the Heligoland Bight, RAF attacks shifted to the cover of darkness, initiating the Defence of the Reich campaign.

Each sector named a Himmelbett (canopy bed) would direct the night fighter into visual range with target bombers.

[4] In the night of 14/15 April 1945, Hißbach and his crew of Hubert Varzecha and Max Mayer were killed in action when they were shot down by anti-aircraft artillery.

The three were strafing a US resupply column, destroying eight vehicles, in the area of Gelnhausen when their aircraft was hit and exploded.

[5] According Spick, Hißbach was credited with 34 nocturnal aerial victories, claimed in approximately 200 combat missions.