The English army moved off on 1 August, southwards to the River Seine and then towards Paris. By 12 August they were 20 miles from Paris. They then turned north, and a month after the capture of Caen the English won the Battle of Blanchetaque, as they fought their way across the Somme. On 28 August the main French army under Philip VI was crushingly defeated at the Battle of Crécy with heavy loss of life. Edward III ended the campaign by laying siege to Calais, which fell after twelve months securing an English entrepôt into northern France which was held for two hundred years.