In 2510 the Balchoth crossed Anduin at numerous points, passing into the Wold in the north of the Gondorian province of Calenardhon. They met little resistance as Calenardhon had been mostly abandoned long before, and by the time the North Army of Gondor appeared from the fortresses of Isengard, Aglarond and other fortresses in the White Mountains the bulk of the Balchoth army had crossed. The North Army counter-attacked, and was driven into the Wold, cut off from the later reinforcements by the Balchoth host. By the time the South Army appeared, the North Army had come under attack by an orcs band which by chance or design had descended from the mountains, and the Dúnedain were backed against the river in a hopeless situation.