On 12 August 1415, Henry sailed for France, where his forces besieged the fortress at Harfleur, capturing it on 22 September. Afterwards, he decided to march with his army across the French countryside toward Calais despite the warnings of his council. On 25 October, on the plains near the village of Agincourt, a French army intercepted his route. Despite his men-at-arms' being exhausted, outnumbered and malnourished, Henry led his men into battle, decisively defeating the French, who suffered severe losses. It is often argued that the French men-at-arms were bogged down in the muddy battlefield, soaked from the previous night of heavy rain, and that this hindered the French advance, allowing them to be sitting targets for the flanking English and Welsh archers. Most were simply hacked to death while completely stuck in the deep mud. Nevertheless, the victory is seen as Henry's greatest, ranking alongside the Battle of Crécy (1346) and the Battle of Poitiers (1356) as the greatest English victories of the Hundred Years' War.