Akagi (赤城) was a steel-hulled, steam gunboat, serving in the early Imperial Japanese Navy. She was the fourth and final vessel to be completed in the four-vessel Maya class and was named after Mount Akagi in Gunma Prefecture.
ORP Gryf was a large Polish Navy minelayer, sunk during the 1939 German invasion of Poland. She was one of two large Polish ships that were not evacuated to Great Britain during Operation Peking prior to the outbreak of the Polish Defensive War. She was sunk in Hel harbour on 3 September 1939 during the opening stage of World War II.
Yoshino (吉野) was a protected cruiser of the Imperial Japanese Navy. Yoshino is sometimes regarded as a sister ship to Takasago, although the two vessels are of different classes. The name Yoshino comes from the Yoshino mountains, located in the southern portion of Nara prefecture. She played an important role in the First Sino-Japanese War, but was sunk in the Russo-Japanese War after being rammed by Japanese armored cruiser Kasuga in dense fog.
ORP Wicher, the lead ship of the Wicher class, was a Polish Navy destroyer. She saw combat in the Invasion of Poland, which began World War II in Europe. She was the flagship of the Polish Navy. She was sunk by German bombers on 3 September 1939.
The Insect-class gunboats were a class of small, but well-armed Royal Navy ships designed for use in shallow rivers or inshore. They were intended for use on the Danube against Austria-Hungary. The first four ships—Gnat, Mantis, Moth and Tarantula—were first employed during the Mesopotamian Campaign of the First World War on the Euphrates and Tigris rivers.
Rurik was an armoured cruiser built for the Imperial Russian Navy in the early 1890s. She was named in honour of Rurik, the semi-legendary founder of ancient Russia. She was sunk at the Battle of Ulsan in the Russo-Japanese War of 1904–05.
Akitsushima (秋津洲) was a protected cruiser of the Imperial Japanese Navy (IJN), designed and built by the Yokosuka Naval Arsenal in Japan. The name Akitsushima comes from an archaic name for Japan, as used in the ancient chronicle Kojiki.
Boyarin was a protected cruiser built for the Imperial Russian Navy by Burmeister & Wain in Copenhagen, Denmark. She served in the Russian Pacific Fleet and was sunk by a Russian naval mine near the entrance to Port Arthur, Manchuria, just after the start of the Russo-Japanese War in 1904.
Turunmaa was a Finnish gunboat built in 1918. She served in the Finnish Navy during World War II. The ship was named after Turuma, a type of frigate designed for use in shallow waters of the archipelago and served in the Swedish Archipelago fleet in the late 18th century. The frigates had in turn been named after the region of Finland.
ORP Mazur was a torpedo boat, then gunnery training ship of the Polish Navy. She was the former German torpedo boat V-105. She took part in the Polish Defensive War and was sunk by German bombers on September 1, 1939, as the first combat ship lost in the war.
Toba (鳥羽) was a river gunboat of the Imperial Japanese Navy, part of the 11th Gunboat Sentai, that operated on the Yangtze River in China during the 1930s, and during the Second Sino-Japanese War and World War II.
Pallada was the lead ship in the Pallada class of protected cruisers in the Imperial Russian Navy. She was built in the Admiralty Shipyard at Saint Petersburg, Russia. The new class was a major improvement on previous Russian cruisers, although the armor protection was light.
ORP Komendant Piłsudski was a Filin-class guard ship originally built at Ab Crichton in Turku, Finland, for the Imperial Russian Navy. She was bought by the Polish Navy in 1920 and served until scuttled in the Invasion of Poland on September 30, 1939.
USS Surprise (PG-63), the fourth American naval ship of the name, was a Temptress-class gunboat patrol gunboat during World War II. She was built as the British Flower-class corvette HMS Heliotrope, and was in service with the Royal Navy during the first years of the Battle of the Atlantic. She was loaned to and operated by the United States Navy from 1942-1945. After World War II she was sold as a merchant vessel and ended her life in the Chinese navy as Lin I.
Saga (嵯峨) was a river gunboat of the Imperial Japanese Navy, that operated on the Yangtze River and in coastal waters of China during the 1930s, and during the Second Sino-Japanese War and World War II.
Chihaya (千早) was an unprotected cruiser of the Imperial Japanese Navy. The name Chihaya comes from Chihaya Castle, near Osaka, the site of one of the battles of the Genkō War of 1333.
The Romanian Navy during World War II was the main Axis naval force in the Black Sea campaigns and fought against the Soviet Union's Black Sea Fleet from 1941 to 1944. Operations consisted mainly of mine warfare, but there were also escort missions and localized naval engagements. The largest naval action fought by the Romanian Navy was the 26 June 1941 Raid on Constanța, and its most extensive operation was the 1944 evacuation of the Crimea.
NMS Mihail Kogălniceanu was a monitor of the Romanian Navy. She saw service in both world wars, being the most successful vessel in her class of four ships. Like her three sisters, she was initially built as a river monitor, but in early 1918, she was converted to a sea-going monitor. During the Second Balkan war, she supported the Romanian crossing of the Danube into Bulgaria. During World War I, she carried out numerous bombardments against the Central Powers forces advancing along the shore of the Danube and carried out the last action of the Romanian Navy before the 11 November 1918 armistice. She later fought successfully against Bolshevik naval forces during the early months of the Russian Civil War, helping secure the Budjak region. During the interwar period, she contributed to the suppression of the Tatarbunary Uprising and was rearmed with longer main guns towards the end of the 1930s. During World War II, she fought several engagements against the Soviet Navy in the first month of the Eastern Front, but was ultimately sunk by Soviet aircraft shortly after Romania ceased hostilities against the Soviet Union, on 24 August 1944.
Russian Empire 
Poland
