The siege of Tournai was a two-month siege of the city and citadel of Tournai, then part of the Austrian Netherlands, in 1745 during the War of the Austrian Succession. The allied Pragmatic Army's attempt to relieve the siege resulted in the decisive French victory at the Battle of Fontenoy on 11 May. The largely Dutch garrison of the city subsequently surrendered to French forces on 22 May, while the garrison of the citadel surrendered on 19 June 1745. It was one of the longest sieges of the war.
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