Romanian Black Sea Fleet during World War I

Romanian Black Sea Fleet during World War I
The minelayer Alexandru cel Bun following behind the protected cruiser Elisabeta
Date 1916–1917 Location Danube Delta (mainly Sulina) Result Romanian victory – Successful defense of Sulina and the Danube Delta throughout the entire Romanian Campaign
Belligerents
Romania	German Empire  Ottoman Empire  Austria-Hungary
Strength
1 cruiser 3 torpedo boats 1 gunboat 1 minelayer 1 brig	1 cruiser 1 submarine 1 monitor Unknown seaplanes Unknown ground forces
Casualties and losses
1 torpedo boat sunk	1 submarine sunk 1 monitor sunk 1 seaplane captured (damaged) Unknown ground casualties

During World War I, the Black Sea Fleet of the Romanian Navy fought against the Central Powers forces of the German Empire, the Ottoman Empire and Austria-Hungary. The Romanian warships succeeded in defending the coast of the Danube Delta, corresponding to an area around the port of Sulina, while also aiding in the Delta's defense from inland Central Powers forces.