"Dynasty Warriors 4: Empires (真・三國無双3 Empires (Shin Sangokumusou 3 Empires) in Japan) is the second expansion of Dynasty Warriors 4, released exclusively for the PlayStation 2 on August 31, 2004 in the United States. The game adds a new strategy mode called 'Empire Mode' which is based on the Romance of the Three Kingdoms series. However, the gameplay during attacking or defending against opposing forces is exactly the same as the original Dynasty Warriors 4. The main goal in Empire Mode is to conquer the land in order to beat the game, by invading and conquering all areas and territories of China."
Source: Wikipedia, "Dynasty_Warriors_4", available under the CC-BY-SA License.