In the Kamakura period this deliberate conduct of hostilities was called kosen (intentional war) and defensive action was called bosen (defensive war), and they were collectively known as 'kosen-bosen'. |
鎌倉時代にはこうした意図的な戦闘行為を故戦(こせん)、それに対する防衛を防戦(ぼうせん)と呼び、これらを一括して「故戦防戦」と呼んだ。 |