The Islam of the 18th, 19th and first half of the 20th century was a poor thing. Nobody bothered about it. Islam was that funny sort of pure system of beliefs that depressed people in the Middle East held as their religion.
The revival of Islam dates from the early years of the 20th century. It was brought about by their humiliation, by their sense of how low they'd fallen compared with the West.
Slavery in the modern world implies the absolute deprivation of the individual's liberty, while possession of weapons and mastery of their use are means to the individual's liberation. We do not perceive how a man may be armed and at the same time bereft of his freedom.
Soldiers, when committed to a task, can't compromise. It's unrelenting devotion to the standards of duty and courage, absolute loyalty to others, not letting the task go until it's been done.
The great Chinese classics have always said that it's better not to fight; that the clever man achieves his ends without violence; that a battle delayed is better than a battle fought.