The word 'outpost' is a singular, common noun; a word for a small military unit or position at a distance from the main force; a remote part of a kingdom or empire; a thing. A noun is used as the subject of a sentence or clause, and the object of a verb or a preposition. Example sentence:
The soldiers were put in the outpost to guard against surprise attacks.
The noun 'outpost' is the object of the preposition 'in'.
compound object
I'm going to go check up on our folks at the outpost.
The English government wanted to use Georgia as an outpost against the Spanish in Florida and the French in Louisiana.
The newly arrived unit begin garrisoning the abandoned outpost after establishing pickets to warn of attack.
The Outpost - opera - was created in 1900.
Outpost Harry happened in 1953.
Cyberian Outpost was created in 1994.
The Outpost - novel - was created in 1886.
As a fur-trading outpost.
An Outpost of Progress was created in 1896.
Outpost Gallifrey was created in 1995.
As a fur-trading outpost.