The Dragon Clan Army was a special case in Rokugan. Because the Dragon Clan only had one true bushi family, the Mirumoto family, they only had one army. This had never presented itself as a problem mostly due to the fact that they occupied a very defensible position in the northern mountains of Rokugan as well as never seeking to expand their borders. No invading Rokugani enemy had ever progressed further into the mountains than Shiro Kitsuki. Only the Naga had ever managed to breach the Dragon defenses entirely, not being stopped until they reached the High House of Light itself in 1131-1132. This went completely different during the War of Dark Fire and the ensuing Destroyer War, being many Dragon strongholds wiped out.