Why did Edward III resume military operations in Gascony in 1345?

Edward III resumed military operations in Gascony and Guyenne in 1345 primarily because the murder of Jacob van Artevelde in July 1345 made it difficult for the English to continue using Flanders as a base for their operations against France.1

Following the expiration of earlier truces and the failure of diplomatic efforts to resolve the conflict, this shift in strategy allowed the English to open a new front. The campaign proved successful, as Henry of Grosmont, 1st duke and 4th earl of Lancaster, defeated French forces at Auberoche in October 1345 and captured La Réole, which emboldened Edward III to further escalate the war.12

Would you like to know more about the specific military tactics used during these campaigns or the subsequent events leading to the Battle of Crécy?