Despite fighting on two fronts simultaneously, the Spanish Army of Flanders managed to defeat the Dutch at Kallo in June while Thomas Francis, Prince of Carignano and the Imperial auxiliary corps under Ottavio Piccolomini lifted the French Siege of Saint-Omer in July.

[2] An Imperial-Spanish relief force commanded by Piccolomini with 5,000 cavalry and 9,000 infantrymen[3] arrived in early morning of 7 June to lift the siege.

In the morning, the Imperials attacked the opposing positions, then the battle stopped for a while which allowed the French to line up (11:00), while Piccolomini sent reinforcements inside the fortress.

The French army lost 6,000 dead and wounded as well as 3,000 prisoners including Feuquieres, who died from his injuries, and Count Pas, commander of the infantry.

[5] In 1643 the Duc d'Enghien capitalised on his victory at Rocroi by pushing on to Thionville, which fell after a stubborn defence by the Spanish garrison.