The Galeb class were minelayers originally built as minesweepers for the Imperial German Navy between 1918 and 1919, and they were also known as the Orao class. In July 1921, the six unarmed vessels were purchased as "tugs" for the navy of the newly created Kingdom of the Serbs, Croats and Slovenes (from 1929, the Kingdom of Yugoslavia). Re-armed with two Škoda 90 mm (3.5 in) guns and two anti-aircraft machine guns, they could also carry 24 or 30 naval mines. Initially classified as mining tenders or mine carriers, they were mainly used for training and "show the flag" cruises along the Adriatic coast and islands, introducing the navy to the populace. In 1931 their guns were re-lined to 83.5 mm (3.29 in) or replaced with guns of that calibre. In 1935 three ships of the class visited the Gr