Casus belli
Act or event that provokes or is used to justify war / From Wikipedia, the free encyclopedia
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A casus belli (from Latin casus belli 'occasion for war'; pl. casus belli) is an act or an event that either provokes or is used to justify a war.[1][2] A casus belli involves direct offenses or threats against the nation declaring the war, whereas a casus foederis involves offenses or threats against its ally—usually one bound by a mutual defense pact.[3][4] Either may be considered an act of war.[5] A declaration of war usually contains a description of the casus belli that has led the party in question to declare war on another party.
"Act of War" redirects here. For other uses, see Casus belli (disambiguation) and Acts of war (disambiguation).