The league of nations was a forum to what? Through its charter, member nations pledged to what?

Well the other guys answer is technically right their a few more details to it. The league of nations was also another attempt to stop further wars between various groups in the world. They didn't want another Holocaust or world war to happen so it made it that all nations would turn on one nation or nations if they did go rogue and attack.

It was created so all the nation can be neutral