Come learn 2000+ kanji and 6000+ vocabulary words with WaniKani.
noun, する verb, の adjective
A war struggle is the part in war where you have to struggle at each other. This is a battle.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
Actually, ninjas tried to avoid combat as much as possible.