Stronghold Legends

Stronghold Legends is a castle-based real-time strategy game by Firefly Studios. It follows in the series of Stronghold and Stronghold 2. Unlike the previous Stronghold titles, Legends gives the player a choice of different starting rulers with different troop types (including King Arthur and his knights of the round table, Count Vlad Dracul, and Siegfried of Xanten). Other new features include cooperative multiplayer against computer-controlled opponents and the choice between different gameplay options for online play (Death-match, King of the Hill, Economic War, and Capture the Flag).

Source: Wikipedia, "Stronghold Legends", available under the CC-BY-SA License.