U-boat flotillas of World War II Name Type Base 1st U-boat Flotilla Combat Brest 2nd U-boat Flotilla Combat Lorient 3rd U-boat Flotilla Combat La Rochelle 4th U-boat Flotilla Training Stettin 5th U-boat Flotilla Training Kiel 6th U-boat Flotilla Combat St. Nazaire 7th U-boat Flotilla Combat St. Nazaire 8th U-boat Flotilla Training Danzig 9th U-boat Flotilla Combat Brest 10th U-boat Flotilla Combat Lorient 11th U-boat Flotilla Combat Bergen 12th U-boat Flotilla Combat Bordeaux 13th U-boat Flotilla Combat Trondheim 14th U-boat Flotilla Combat Narvik 18th U-boat Flotilla Training Hela 19th U-boat Flotilla Training Pillau 20th U-boat Flotilla Training Pillau 21st U-boat Flotilla Training Pillau 22nd U-boat Flotilla Training Gotenhafen 23rd U-boat Flotilla Combat/Training Salamis/Danzig 24th U-boat Flotilla Training Memel 25th U-boat Flotilla Training Libau 26th U-boat Flotilla Training Pillau 27th U-boat Flotilla Training Gotenhafen 29th U-boat Flotilla Combat La Spezia 30th U-boat Flotilla Combat Konstanza 31st U-boat Flotilla Training Hamburg 32nd U-boat Flotilla Training Königsberg 33rd U-boat Flotilla Combat Flensburg