For expeditions to fight barbarians, Seii Taishi (great general who subdues the barbarians) or Seito Taishi (great general who subdues the eastern barbarians) was appointed and Seitogun (expeditionary force) was organized under him.
征夷の際には、征夷大使（将軍）や征東大使（将軍）が任命され、征討軍が編成された。