Wars of the 20's and 30's - expect I've missed a lot of "minor" conflicts.
The Turkish War of Independence (1919-1922) ---- probably best kept as part of DoF
Greco-Turkish War (1921-1922)–Greek invasion of Turkey. Is considered part of Turkish War of Independence. The Greek offensive failed. ---- probably best kept as part of DoF
Russian Civil War (1917-1922) ---- probably best kept as part of DoF
Polish-Soviet War (1919-1921)–Major war between Poland and Russia/The Soviet Union. ---- probably best kept as part of DoF
Gran Chaco Wars (1928-1935) Bolivia, Paraguay
Sino-Japanese War (1937-1945)
Second Italo-Ethiopian War (1935-1936)–(also known as the Abyssinian War)–Italy’s Fascist dicator, Benito Mussolini, wanted to conquer a new “Roman Empire,” and chose Ethiopia as his first victim. Ethiopia had defeated Italy in the First Italo-Ethiopian War in 1896, and Mussolini sought revenge for that embarrassing Italian defeat. This war exposed the inherent weaknesses of the League of Nations (an earlier and very weak version of the United Nations) when it was unable to prevent war. Italy successfuly conquered Ethiopia in 1936. During World War Two, British, Commonwealth, Free French, Free Belgian, and Ethiopian forces liberated Ethiopia in 1941
Spanish Civil War (1936-1939)–The Spanish Civil War began as a right-wing rebellion against the leftist Republican government of Spain. Led by General Francisco Franco, the Nationalist rebels fought a long and bloody civil war against their Republican foes. Franco was received significant military aid from Nazi Germany and Fascist Italy. The Republican side was aided by the Soviet Union. Franco won the war in 1939 and set up a Fascist government. This war is considered one of the precursor conflicts leading to World War Two.