The Six-Day War - of choice.

"For Israel, the Six Day War was a war of choice. It did not have to fight it. The main reason that Israel went to war was the incessant pressure that the general staff applied on the cabinet. Israeli generals sensed the enemy’s immense weakness and wanted to use this opportunity to strike a deadly blow. For over a decade, the Israeli army had perfected plans for a swift offensive that would allow it to conquer significant chunks of Arab territory. Another key aim of Israeli war plans was to trap Egyptian forces in northern Sinai and turn that area into a killing zone. Peled, the Israeli general, let the cat out of the bag four decades ago when he wrote: “When we were mobilizing all out forces… this power was necessary to eliminate definitively the Egyptians.”

https://www.counterpunch.org/2017/06/06/was-israel-under-existential-threat-in-june-1967/