Army of the West
The Army of the West was the great host prepared by the Lords of Gondor and Rohan to march on the Black Gate after the Battle of the Pelennor Fields. They left Minas Tirith two days after the council of the Last Debate with a force of 7,000 men: 6,000 on foot and 1,000 on horse.
When the host reached the Cross-roads, the captains stationed a strong force of archers there, to guard against any attack from the East or South. Also along the way some 1,000 faint-hearted men who would not approach the Black Gate were commanded to liberate Cair Andros.
The Army of the West fought in the Battle of the Morannon with less than 6,000 men total, but because of the destruction of The One Ring, they were able to achieve a very decisive victory. It is not told how many casualties the army suffered though it was apparently few.