Some evidence: Greece withdrew from Bulgaria in 1925 on the league’s orders as she could not afford a full-scale war.
Another thing that meant the League of Nations could succeed easily was that there was a peaceful universal atmosphere because of all the of work that was being done by the other organisations and some other agencies. This meant that the league wasn’t seriously challenged.
Some evidence: the international labour organisation, and the aims to encourage co-operation in business and trade.
After the great war, many nations that had been strong / aggressive before; had been -weakened by the war. In result of this; no one had the military or pecuniary assets to start another war. Consequently, the league was not faced with any threat of conflict. This made the job of the league more easier and peace was more likely to commence.
Some evidence: The league managed to settle the dispute between Greece and Bulgaria in 1925 because Greece was weak and was in no position to challenge the authority of the league.
Failures: A major fault for the league was that the U.S.A didn’t join the league of nations. America had the biggest standing army (make the league stronger), it was the most powerful country in the world, and without the backing of the USA, the permanent members of the league would be able to pursue policies and pass resolutions which promoted their own interest.
Some evidence: without the USA’s army, the league lacked the power it needed to utilize
Cogency against Mussolini in the Corfu incident.
Another thing is that the league lacked a standing army. After honest disapproval and the submission of fiscal sanctions the league could alternatively force to uphold its decisions. However the league had to rely on the other major members to sacrifice their own armies. America has the biggest army and, as you would have guessed, the other countries didn’t want to give their armies to the nations.
Some evidence: at the Vilna case in 1920, the league lacked its own army to enforce its belief the Vilna should be given back to Lithuania.
To conclude, I think that the league of nations was more of a failure in the 1920’s. I think this because, the strongest, most powerful nation in the world at the time wasn’t a member, the league was dominated by Britain and France, and, finally, the league had no standing army. This made the league very weak and therefore, made it next to impossible to succeed what it was set up to do.