
The shrine of Imam Yahya Abu al-Qasim in the city of Mosul before it was dynamited by ISIS
(Wikimedia Commons)
One of the best things that can be done in a war is to foment mutual mistrust within the ranks of an enemy. There is always the real risk of losing genuine informants, of course, but to have members of the enemy force turn on one another will destroy morale, hinder communications, deplete their corps of enthusiastic fellow fighters, reduce tactical agility, and have many other highly desirable effects: