Uncle Fuzzy has always had an affinity for under-documented, obscure pre-WWII conflicts. Don't ask me why, but the smaller scale and often remote locations just hold a lot of interest for me.
I thought I'd list a few examples to get people started doing some research. I really like Wikipedia for this, as it provides good, concentrated histories of all these events.
-The Russo-Polish war of 1919-1921 http://en.wikipedia.org/wiki/Polish-Soviet_War -The Gran Chaco war of 1928-1935 (Bolivia vs. Paraguay--you may know this from the Tintin book L'Oreille Cassée.) Loads of armor/air action. http://worldatwar.net/chandelle/v1/v1n3/chaco.html -The Franco-Thai war of 1940-1941 and the battle of Koh Chang http://en.wikipedia.org/wiki/French-Thai_War -The Spanish Civil war 1936-1939 http://en.wikipedia.org/wiki/Spanish_Civil_War Lobo posted some wicked cool links with goofy Spanish weaponry, including armored "tiznaos": http://republicaomuerte.iespana.es/tiznaos.htm http://www.barranque.com/guerracivil/arcarazotanques.htm http://www.sbhac.net/Republica/Fuerzas/Armas/Blindados/Blindados.htm -The second Sino-Japanese war and the preceding series of "incidents" 1931-1945 http://en.wikipedia.org/wiki/Sino-Japanese_War_(1937-1945) -The Anglo-Iraq War, 1941 http://en.wikipedia.org/wiki/Anglo-Iraqi_War -The second Italo-Abyssinian war (Italian invasion of Ethiopia), 1935-1936 http://en.wikipedia.org/wiki/Second_Italo-Abyssinian_War -The Italian invasion of Albania, 1939 http://www.onwar.com/aced/data/india/italyalbania1939.htm -The Chinese Northern Expedition and Nationalist-Communist civil war 1925-1949 (with breaks for sushi delivery) http://en.wikipedia.org/wiki/Chinese_Civil_War -The second Greco-Turkish war 1921-1922 http://www.onwar.com/aced/chrono/c1900s/yr20/fgreekturk1921.htm
This is by no means complete; I'm leaving out numerous smaller civil wars, as well as loads of tiny border conflicts.
OnWar also has a good overview, with divisions by nation, timeline, etc. at http://www.onwar.com/aced/index.htm
Have fun, happy researching!
Fantastic compilation, though you should remove the statement "pre-war" as a lot of it is not really pre-war. I've always enjoyed reading about the Franco-Thai Conflict (being a quarter Thai myself). A part of me enjoys reading about how the Vichyites got pummeled, while another part wants me to sympathize for them as a troubled, undersupplied and already-beaten-by-the-Japanese quarter of the French Empire.