After the First World War, the boundaries of Greece and Albania still needed sorting out. The League gave this job to an Italian General called Tellini.
While they were surveying an area in Greece, Tellini and his team were ambushed and killed.
The Italian leader, Mussolini, was furious when he found out and blamed the Greek government for the murder. He demanded that Greece pay compensation to Italy and execute the murderers. The Greeks, however, had no idea who the murderers were.
On 31 August 1923, Mussolini invaded and occupied the Greek island of Corfu. Fifteen people were killed.
Greece appealed to the League for help. The League condemned Mussolini's actions. It also suggested that Greece pay compensation but the money be held by the League. The money would then be paid to Italy if, and when, Tellini's killers were found.
Mussolini still wasn't satisfied. He complained to the Conference of Ambassadors and persuaded it to undermine the League. The Greeks had to apologise and pay compensation directly to Italy. Mussolini also withdrew from Corfu boasting of his triumph.