High Quality Content by WIKIPEDIA articles! Empire Earth: The Art of Conquest, also known as AoC, is the official expansion pack for the real-time strategy game Empire Earth. Art of Conquest was developed by Mad Doc Software, and was released on 17 September 2002 in the United States. The game was released in Europe later in the year, and the following year in Japan. The Gold Edition of Empire Earth, which features both the original and the expansion, was released on 6 May 2003.