Hungary–Romania relations
During World War II, Hungary and Romania became allies and participated in the war against the Soviet Union. But after the coup on 23 August 1944 Romania switched sides and fought against Hungary. Consequently, Soviet and Romanian troops invaded Hungary, occupied Northern Transylvania by October 1944 and re-established the Romanian administration in the region in March 1945. The 1947 Treaty of Paris reaffirmed the borders between Romania and Hungary as originally defined in Treaty of Trianon 27 years earlier, thus confirming the return of Northern Transylvania to Romania.
List of main Romanian Navy warships of World War II
This is a list of main warships operated by the Romanian Navy during the Second World War. It includes major surface warships and submarines. Each surface warship in this list is armed with at least two main guns of a caliber greater than 4 inches (102 mm) or with torpedo tubes, and has a range of over 1,200 km (650 nautical miles). The fore-mentioned range is the minimum required for a journey along the maximum East-West extent of the Black Sea, which amounts to a distance of 1,175 km (730 miles or 635 nautical miles). The Black Sea was the naval front where the Royal Romanian Navy operated throughout the war.