Britain allied itself with Maria Theresa, while Louis XV forged an alliance with Frederick. Louis provided military support in the form of detachments from France's Irish Brigade, in support of Charles Edward Stuart during the Jacobite rising of 1745. The Pragmatic Allies initially defeated the French in the Battle of Dettingen in 1743 but the battle had little effect on the wider war and has been described as "a happy escape, rather than a great victory". A series of French victories (including Marshal de Saxe's great triumph at Fontenoy in 1745) made the French conquest of much of the Austrian Netherlands possible; however, this territory was returned to Austria at the end of the war.