After the birth of Christ, from 100 A.D. to 250 A.D. (late Yayoi), warfare spread for the first time on the Japanese archipelago. Agriculture created an imbalance of power between villages, which was only rectified by fighting. | After the birth of Christ, from 100 A.D. to 250 A.D. (late Yayoi), warfare spread for the first time on the Japanese archipelago. Agriculture created an imbalance of power between villages, which was only rectified by fighting. |