Following the Versailles settlement, Vilna, with a largely Polish population, was made the capital of the newly formed state of Lithuania.
A Polish army seized the city in 1920; as a result of which Lithuania appealed to the League.
The League requested for Polish troops to withdraw while a plebiscite was arranged but Poland refused.
The matter was then passed on to the Conference of Ambassadors who took the path of least resistance and awarded Vilna to Poland.
Ruhr, 1923:
When Germany refused to pay reparations in 1922, the matter should have been referred to the League.
Instead, France, supported by Belgium, decided to take swift and unilateral action. They did this by ordering their troops to occupy the Ruhr in January 1923.
This action served to confirm the impression of many that the League was little more than a visitors' club for the pursuit of victors' interests.
In August 1923, Mussolini ordered the naval bombardment and occupation of GreekislandCorfu