Jews invented the Zealot, the controlled berserker. Before that, you could have a disciplined army who fought with ordinary fervor and strength, or berserkers who were like whirlwinds of death, but could not be controlled, and were as much a danger to their own side. It was the atomic weapon of the time and it scared the Romans so much that they completely leveled Jerusalem, with its temple, along with the rest of Israel . The Byzantine emperor, Constantine, tried with some success to replicate the zealot using Christianity as a kind of Judaism-lite, and the Pervert Mohommad also achieved success with his invented death-cult based on a mish-mash of Jewish and Christian doctrines, though with less discipline.