Stronghold: Crusader (2002)

Stronghold: Crusader is the successor to Firefly Studios's 2001 real-time strategy video game Stronghold. Crusader has much in common with the original Stronghold, but differs from its predecessor in the fact that the game is no longer set in a pseudo-Europe, instead being set in the Middle East during the Crusades. The game features a multitude of new Arabian units that can be purchased in a new building, the mercenary post. (wikipedia.org)