During World War I, Greece belatedly entered the war on the side of the Triple Entente and, due to Greece's neutrality the four Niki class ships were seized by the Allies in October, 1916, taken over by the French in November and served in the French Navy from 1917-18. By 1918, they were back on escort duty under Greek colors, mainly in the Aegean Sea.
Niki saw action in the Greco-Turkish War (1919-1922). In 1919, she conducted escort missions in the Black Sea carrying Greek refugees from Pontus. Later, while covering the Greek Army's disorganized retreat after the fall of Smyrna on September 4, 1922, Niki's commander, Lt. Commander D. Hatziskos was killed by a sniper.
After the war, Niki was refurbished from 1925-1927. She also participated in the Second World War, first carrying supplies in the Ionian Sea and after surviving the German invasion of April, 1941, Niki served in conjunction with the Royal Navy based in Alexandria, Egypt. After the end of World War II, Niki was stricken in 1945.