His rise was the culmination of decades of planning and outmanoeuvring of opponents, turning a movement into the Sinwar show. In prison in Israel, this violent and calculating man became more systematic in his thinking,

Israel succeeded Wednesday in its year-long mission to kill Hamas leader Yahya Sinwar, the man accused of being one of the masterminds of the October 7, 2023 attacks.

Mr. Sinwar, one of the main architects of the Oct. 7 Hamas-led attack on Israel, spent decades with the militant group, working his way to the top of its leadership.