Battles in the Sengoku Period include various forms of war such as armed conflict with low-intensity like demonstrative actions or skirmishes, a form of war that was to a certain extent comparable to later all-out war like the Battle of Sekigahara which was a decisive battle fought by dividing all forces in Japan into two and even if there is a doubt if we can say that it occurred in the Sengoku Period, it was on the extension of the Sengoku Period, and the Bunroku/Keicho War which was war to invade a foreign country.
戦国時代における合戦には、示威行動や小競り合いといった、低強度の武力闘争から、戦国時代に含めるか否かは別として、少なくとも戦国時代の延長線上にはある関ヶ原合戦のように、国内を二分しての会戦・決戦といった、後の国家総力戦にある程度擬し得る戦争形態、さらには、文禄・慶長の役である文禄・慶長の役まで、多様な戦争形態が見られる。