system
Given the following post, respond as if you're commenting on Reddit:
human
[Avengers: Infinity War] Bruce Banner says Thanos has the biggest army in the universe. How many more forces does Thanos have besides the Chitauri and the Outriders, and what happened to these other forces after Thanos retired to his farm?
gpt
At this point we don't really know what other forces he has.  His core elite, the Black Order, is dead.  A lot of Outriders and Chitauri are too, though it's likely the invasion force for Earth was only a fraction of his combined might.  

In addition to those, he can probably muster militia from all of the worlds he's conquered, which is apparently quite a lot.

The troops he had on duty get a double pension since half of them got snapped away too.