http://www.onwar.com/chrono/1940/jul40/f20jul40.htm
German night-fighter achieves kill
Saturday, July 20, 1940 www.onwar.com
An Me110 of NJG 1specially outfitted for night fighting, with its pilot and radio operator prepare for take off.
Over Germany... First Lieutenant Werner Streib in an Me110 night-fighter, using only visual contact, achieves the first nighttime kill of the war by shooting down a British Whitley bomber over northwestern Germany.
In Berlin... Goring, the commander in chief of the Luftwaffe, orders the creation of the first specialized night-fighter wing — Nachtjagdgeschwader 1 (NJG 1) — under the command of Colonel Josef Kammhuber.
In the Mediterranean... Off the coast of Tobruk in Libya, 2 Italian destroyers and a cargo ship are torpedoed by British Swordfish torpedo bombers.