Bulgarian naval aviators also played an important role in the air war. In 1912 Petty-Officers Lyapchev and Mikhailov were sent, along with other officers and seamen, to the German naval aviation forming facilities for training. Another group of naval personnel followed in the beginning of the First World War. Training was held at List, Nordenhai and Kiel. In November 1915 a seaplane station under German control was established near Varna, initially operating four Friedrichshafen FF.33 bombers and a Rumpler 6B1 fighter. Later, at the coast of the Varna Lake, a second seaplane station was built (this one under Bulgarian control), operating the same inventory. Near Sozopol a forward fuel and ammunition replenishment base was established in support of patrol flights over the southern Bulgarian coastline. At the end of 1917 the German station was transferred to the Bulgarian Navy. At the time of the armistice the Bulgarian fleet air arm comprised two seaplane stations, a forward replenishment base, three hangars, three workshops, ammunition warehouses and 10 seaplanes. After the cease-fire the machines were used for mine reconnaissance. At the end of 1919 they are transported by train to Bozhurishte Airfield to be scrapped along with the army aviation inventory.