What type of forces did Sauron had in the second age?

[Kuruharan]

Originally Posted by Victariongreyjoy

Does this imply to bats, wargs, fell beast, mumakil, crebain crows, spiders and trolls?

I would think so.

Originally Posted by William Cloud Hicklin

It's pretty much impossible to say what peoples and nations inhabited what parts of Middle-Earth some 4500 years before the War of the Ring, except for Lindon, Eregion, Moria and what very little Tolkien tells us of the Numenorean holdings.

True, but in general I think we can assume that the peoples of the East and South lined up with Sauron.

In some respects we never knew much about the peoples of the East and South so the greater obscurity regarding them in the Second Age is only slight.