Army of the West
Two days after the council of the Last Debate, a force of 7,000 men left Minas Tirith on March 16, 3019. Under Aragorn were 2,000 of those who sailed with him up the Anduin; under Imrahil were 3,500 (probably from among the original defenders of the city); under Éomer were 500 Rohirrim unhorsed, and another 500 horsed; and lastly another 500 horsed Knights of Dol Amroth, Rangers of the North, and the two sons of Elrond: 6,000 men 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.