Something like StarCraft, but each unit has to be piloted by a human (using a first person shooter interface). The leader player sees the traditional high-level StarCraft interface, and directs the troops. Each individual troop sees some on-screen representation of its “orders” (“attack this unit”, “move over here”).
It's called Natural Selection and it was pretty cool. I think people still play. https://www.naturalselection2.com/ The creators went on to make Subnautica.
There have been other takes on this concept too, but Natural Selection is probably the closest to your description. BattleZone (1998) was also a hybrid of RTS and FPS but the units were mostly computer controlled.