Stronghold was a commercial success, with global sales above 1.5 million units by 2004. In the English version, the game takes place in Medieval Britain around the year 1066 however, since there is not always a time limit, scenarios can continue hundreds of years beyond that date. There is both an economic and a military campaign to be played and both are discussed in the game manual. The game focuses primarily on conquest and expansion through military pursuits but also has prominent economic and infrastructure development elements. Stronghold is a historical real-time strategy video game developed by Firefly Studios and published in 2001 by Take 2 Interactive and Gathering of Developers for Microsoft Windows and Mac OS X.