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Battle of Crécy and the taking of Calais

In July 1346, Edward mounted a major invasion across the channel, landing on Normandy's Cotentin Peninsula at St Vaast. The English army captured the city of Caen in just one day, surprising the French. Philip mustered a large army to oppose Edward, who chose to march northward toward the Low Countries, pillaging as he went. He reached the river Seine to find most of the crossings destroyed. He moved further south, worryingly close to Paris until he found the crossing at Poissy. This had only been partially destroyed, so the carpenters within his army were able to fix it. He then continued to Flanders until he reached the river Somme. The army crossed at a tidal ford at Blanchetaque, stranding Philip's army. Edward, assisted by this head start, continued on his way to Flanders once more until, finding himself unable to outmaneuver Philip, Edward positioned his forces for battle, and Philip's army attacked.

The Battle of Crécy of 1346 was a complete disaster for the French, largely credited to the English longbowmen and the French king, who allowed his army to attack before it was ready. Philip appealed to his Scottish allies to help with a diversionary attack on England. King David II of Scotland responded by invading northern England, but his army was defeated, and he was captured at the Battle of Neville's Cross on 17 October 1346. This greatly reduced the threat from Scotland.

In France, Edward proceeded north unopposed and besieged the city of Calais on the English Channel, capturing it in 1347. This became an important strategic asset for the English, allowing them to keep troops safely in northern France. Calais would remain under English control, even after the end of the Hundred Years' War, until the successful French siege in 1558.