system
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human
[LOTR] So after the ring was destroyed and Sauron was gone..what happened to his vast armies of orcs/goblins, wargs, and trolls?

I haven't read the book but in Return of the King, ALL of them basically hit the feet once the tower comes down and the ground starts to collapse.
gpt
When Sauron died most Orcs died in Mordor, when it all began to come tumbling down. Aragorn and his Reunited Kingdom dealt with any surviving force in Gundabad and scattered in Eriador.  Those that survived did so in Moria. However, Durin VII and his Dwarven army retook the city sometime later in the 4th Age, exterminating nearly all the remaining Orcs.