The league had some early successes:
Teschen, 1920: Between Poland and Czechoslovakia. The league intervened and split the land between the two countries. This avoided war and was deemed as a success.
Aaland Islands, 1921: Between Sweden and Finland. After an investigation the League said the Islands should belong to Finland. Sweden agreed, once more avoiding war.
Silesia (upper), 1921: Between Germany and Poland. The was a plebiscite held amongst the people which suggested a partition. Germany and Poland agreed.
Iraq, 1924: The Turks demanded Mosul, a part of Iraq (a British mandate). The League supported Iraq; Turkey agreed.
Bulgaria, 1925: Greece invaded Bulgaria, which did not fight back, but appealed to the…