Water!

This is coolbert:

Water as intuitively understood by all as essential to life itself, in that area of Mesopotamia even more essential. ISIL high command using the indirect form of attack rather than foolish frontal assault.

"ISIS CUTTING OFF WATER SUPPLY TO CHRISTIANS, KURDS IN REGIONS THEY DO NOT CONTROL"

"The Islamic State-- formerly Islamic State of Iraq and al-Sham (ISIS)-- has previously used water as a destructive tool to destroy crops and dams in Shi'ite territory. Now, ISIS is attempting to deprive major Christian strongholds of water through their control of pipe systems."

Water no where and nary a drop to drink. And where and when available only so by the sufferance of the Caliph and his minions.

coolbert.