Not really a "turning point battle." Rocroi was 1643; Spain continued at war with France until 1659. The turning point may have been 1639- Battle of the Downs - when Spain was defeated at sea by the Dutch (Tromp).
The Spanish Road from Italy to the Netherlands had already been compromised, so the only way Spain could reinforce and support their armies in the Low Countries was by sea. After the Downs, it became so much more difficult to do that.
Rocroi was the origin of the reputation of le Duc d'Enghien (Conde) - a "Prince of the Blood." That had to be a big deal, so it became one.