On 17 July Philip led the French army north. Alerted to this, Edward called the Flemings to Calais. On 27 July the French came within view of the town, away. Their army was between 15,000 and 20,000 strong; a third of the size of the English and their allies, who had prepared earthworks and palisades across every approach. The English position was clearly unassailable. In an attempt to save face, Philip now admitted the Pope's emissaries to an audience. They in turn arranged talks, but after four days of wrangling these came to nothing. On 1 August the garrison of Calais, having observed the French army seemingly within reach for a week, signalled that they were on the verge of surrender. That night the French army withdrew. On 3 August 1347 Calais surrendered. The entire French population was expelled. A vast amount of booty was found within the town. Edward repopulated the town with English settlers.