Olog-Hai

The Olog-Hai are one of the intelligent beings in Middle-Earth. Many can be jagged black armour and sent to the front line to serve as some of Sauron's most feared warriors while those serve as allies to the Free Folk.

War of the Ring
During the War of the Ring, the total Olog-Hai population in Gondor is over 3,750,000. The Olog-Hai lived in the mountains for centuries, serving as allies to the people of Gondor while those chose to side with the Dark Lord Sauron.
 * 720,000
 * 600,000
 * 480,000
 * 300,000
 * 240,000
 * 100,000
 * 18,000
 * 9,000
 * 2,500