He landed in Normandy late in the summer of 1415, and laid siege to Harfleur, which then occupied the position that Havre enjoys to-day, and was the chief commercial port at the mouth of the Seine. On the news of Henry's approach, the French factions for once suspended their hostilities, and many of the Burgundians, though not Duke John himself, agreed to assist the Armagnacs in repelling the invaders. But they were so long in gathering that Harfleur fell, after five weeks of siege. The capture, however, had cost the English dear; not only had they lost many men in the trenches, but a pestilence had broken out among them, and a third of the army were down with camp-fever. After shipping off his sick to Southampton, and providing a strong garrison for Harfleur, King Henry found that he had no more than 6000 men left, with whom to take the field against the oncoming French. But he would not withdraw ingloriously by sea, and resolved to march home to Calais across Northern France. This enterprise savoured of rashness, for the whole countryside was swarming with the levies of the enemy. They had placed the Constable of France, John d'Albret, in command: with him were the young Duke of Orleans and all the rest of the Armagnac leaders. Anthony of Brabant, brother to the Duke of Burgundy, was hurrying to their aid from the north. By rapid movements--his whole army, archers as well as men-at-arms, had been provided with horses taken from the countryside--Henry reached the Somme. But he lost time in trying to force a passage, and when at last he crossed the river high up, near Peronne, the Constable and his host had outmarched him and thrown themselves across the road to Calais. They were at least 30,000 strong, five times the force that Henry could put in line, and were in excellent condition, while the English were worn out by their long travel, amid violent October rains, and over bad country crossroads. [Illustration: BATTLE OF AGINCOURT. 1415.] [Sidenote: =Battle of Agincourt.=]