-Poland and Lithuania were new countries created by the post war treaties
-Vilna was the capital of Lithuania but it had a largely Polish population
-In 1920 a private Polish army took control of it
-Lithuania appealed to the League, who asked Poland to withdraw
-Poland refused, troops should have been sent in but France didn't want to upset Poland because they were an ally against Germany and Britain wouldn't act alone
-So the League did nothing and the Polish kept controlling Vilna