system
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human
[Lord of the Rings] How Large was Sauron’s Forces at the Battle Of Minas Tirith?

In the books, the invasion forces number near 40,000, but there isn’t a canonical statement for the army size in the movies. In an interview, Peter Jackson stated that he imagined there to be about 200,000 Orcs. But I would imagine that that doesn’t include all of the other types of monsters that attacked such as the trolls, olliphaunts, etc. How large was Saurons army?

Bonus: how large was the army at The Battle of the Black Gate?
gpt
It's not stated clearly how large the Black Army was at Pelennor Fields, but Mordor had 18,000 Easterlings and Haradrim, several Haradrim war Oliphaunts, and tens of thousands of Orcs; No number were ever specified for Orcs but it's noted that their numbers vastly outnumbered the initial defenders of Minas Tirith of 10,000+ men and the 6,000 Rohirrim Riders reinforcing them. It wasn't until Aragorn came reinforcing them with Gondor's southern fiefdom that they were able to rout Mordor's forces.

As for the Battle of Morannon, the Men of the West had less than six thousand when they confronted Sauron at the Black Gates. It was stated that Sauron with his Orcs, Trolls, Easterlings, Ringwraiths, and Fell Beasts outnumbered them by at least ten to one, thus putting their numbers around 60,000+