While stronger and better armored than the cavalry archers, they are slower and more expensive. The War Wagon fires a bolt similar to the Galleon.
The Castle-based unique unit is the War Wagon, a horse-drawn carriage that is essentially a heavily armored cavalry archer. As a result of their innovation and knowledge of gunpowder (which originated from China, though the Koreans had to develop it separately since the Chinese would not share their secrets) the Koreans are one of the few civilizations that have two unique units. Being able to successfully defend itself despite the numerical disadvantages, they are a defensive civilization similar to the Byzantines, but focuses more toward ranged units. This is represented by a Mangonel with higher range granted by the team bonus and the unique technology.
One of their most recognized innovation was the Hwacha which fires a series of small bolt like rockets. However, their tacticians, most notably Admiral Yi Sun-Shin, made important contributions in innovating cutting edge weaponry when conditions were especially dire during the Japanese invasions and frequent raids from Wokou pirates.
Historically, they were not as powerful compared to the nearby Chinese realms. The Koreans are one of the five civilizations featured in the Conquerors expansion.