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https://en.wikipedia.org/wiki/2001_NATO_Article_5_contingency
The North Atlantic Treaty Organization (NATO) declared an Article 5 contingency through a series of resolutions of the North Atlantic Council enacted between September 12 and October 2, 2001, done in response to the September 11 attacks in the United States. The decision to invoke NATO's collective self-defense provisions was undertaken at NATO's own initiative, without a request by the United States, and occurred despite the hesitation of Germany, Belgium, Norway, and the Netherlands. It is the only time in NATO's history its collective defense provisions have been invoked.