German torpedo boat Falke

Now assigned to the 5th Torpedo Boat Flotilla, Falke was used in the North Sea mining operations that began on 3 September 1939. Together with three destroyers and her sisters Albatros and Greif, Falke was tasked with anti-contraband patrols in the Kattegat and Skaggerak from 3 to 5 October that impounded four ships. Together with the torpedo boat Jaguar, Falke impounded six ships in the Skaggerak during a contraband patrol in 14–16 December.[8] During the Norwegian Campaign, Falke and Jaguar, among other ships, briefly rendered assistance to the torpedoed heavy cruiser Lützow before continuing onwards to Kristiansand on 11 April with reinforcements. On 4–5 June Falke and Jaguar provided the anti-submarine screen from Kiel, Germany, to the Skaggerak for an unsuccessful attempt to intercept the Allied convoys evacuating Northern Norway by the battleships Gneisenau and Scharnhorst and the heavy cruiser Admiral Hipper. From 21–23 June, Falke was one of the escorts for the badly damaged Scharnhorst from Norway to Kiel. Now assigned to the 5th Torpedo Boat Flotilla, Falke, her sister Kondor, and the torpedo boats Jaguar, T2, T7 and T8 escorted minelayers as they laid a minefield in the southwestern North Sea on 7–8 August. The flotilla escorted other minelaying missions in the same area on 14–15 August, 31 August – 2 September and 6–7 September. Reinforced by the torpedo boat Wolf, the flotilla made an unsuccessful sortie off the Isle of Wight on 8–9 October. They made a second, more successful, sortie on 11–12 October, sinking two Free French submarine chasers and two British trawlers. The 5th Flotilla was transferred to St. Nazaire later that month and its ships laid a minefield off Dover on 3–4 December and another one in the Channel on 21–22 December.[9]

Now based in Norway, Falke and the torpedo boat T12 escorted a minelaying mission from Stavanger on the night of 26/27 January 1941 and then another one the following night. Falke escorted another such mission on 3–4 February, together with the 1st and 2nd Torpedo Boat Flotillas. The boat was refitted in Rotterdam, Netherlands, from March to May 1941. She was transferred afterwards to the Skagerrak where she was on convoy escort duties until January 1942 when she rejoined the 5th Flotilla in the West. The flotilla joined the escort force for Scharnhorst, Gneisenau and the heavy cruiser Prinz Eugen on 12 February 1942 off Cap Gris-Nez during the Channel Dash. From 12 March to 2 April, the flotilla escorted the commerce raider Michel through the Channel despite heavy British attacks, damaging the British destroyers HMS Walpole and Fernie. The flotilla escorted the commerce raider Stier through the English Channel from 12 to 19 May. In heavy fighting on the 13th, British motor torpedo boats (MTBs) sank her sister, Seeadler, and the torpedo boat Iltis while losing one of their own boats. Falke was refitted in Wilhelmshaven from June to August and returned to France. Falke and Kondor and the torpedo boats T22 and T23 escorted the Italian blockade runner, SS Cortellazzo, from Bordeaux through the Bay of Biscay on 29–30 November.[10]

Falke, T2, T12, T23, and the torpedo boat T18 escort another Italian blockade runner, Himalaya, but she turned back on 28 March 1943 when spotted by a British reconnaissance aircraft. Falke, Greif, Kondor, Möwe and T22 laid two minefields in the English Channel on 4–6 June. Later that month the ships returned to the Bay of Biscay to help escort U-boats through the Bay and continued to do so into early August. The flotilla was ordered to transfer from Cherbourg to Le Havre and departed on the night of 23/24 May 1944. Möwe, Greif, Falke, Kondor and Jaguar were attacked by Allied aircraft early the next day and Greif was struck by two bombs that set her forward boiler room on fire and caused her to take on water forward. With both boiler rooms subsequently flooded, she was unmaneuverable and accidentally collided with Falke. The latter was only slightly damaged, but Greif's bow was badly bent which caused problems for Möwe when she began to tow her sister. Around 06:00 Greif lost all power and sank at 06:32. At 07:43 Kondor struck a mine and had to be towed by Möwe for the remainder of the voyage.[11]

As the Allies began landing in Normandy on 6 June, the 5th Flotilla, now consisting of Möwe, Falke, Jaguar and the newly refitted torpedo boat T28, sortied multiple times from Le Havre over the next week in attempts to sink Allied shipping. Despite the expenditure of over 50 torpedoes and large quantities of ammunition, they were generally unsuccessful, only sinking the destroyer HNoMS Svenner on 6 June. During an air raid by the Royal Air Force on the night of 14/15 June, bombs sank Falke and Jaguar and badly damaged Möwe.[12]