And Israel vowed a vow. On these vows, and on things "devoted" or "banned" ( חֵרֶם— ἀνάθεμα), see on Le 27:28, and on the moral character of such wholesale slaughters see on Numbers 31:1-54. If it was right to destroy the Canaanites at all, no fault can be found with the vow; it merely did for that military proceeding what national feeling and discipline does for the far more bloody exigencies of modern warfare, removing it from the sphere of private hatred, revenge, and cupidity, and placing it upon a higher level.
The patriot soldier of these days feels himself to be a mere instrument in the hands of the rulers of his people to maintain their rights or avenge their wrongs. The Israelite could not have this feeling, which was foreign to his time and place in history, but he could feel that he was a mere instrument in the hands of God to perform his will upon his enemies.
In either case a must important advantage is secured; the soldier does not slay in order to gratify his own hatred, or in order to satisfy his own cupidity. It is quite true that such vows as are here mentioned would certainly in a more advanced stage of civilization be abused to throw a cloak of religion over frightful enormities; but it does not in the least follow that they were not permitted and even encouraged by God in an age to which they were natural, and under circumstances in which they were beneficial.