After the invasion, Italy controlled the entire eastern Adriatic coast through the annexation of much of Dalmatia, the Italian occupation zone of the Independent State of Croatia, the Italian governorate of Montenegro, and the Italian puppet regime of the Albanian Kingdom (1939-1943).
Naval forces of the Yugoslav Partisans were formed as early as 19 September 1942, when Partisans in Dalmatia formed their first naval unit made of fishing boats, which gradually evolved into a force able to engage the Italian Navy and Kriegsmarine and conduct complex amphibious operations.