In the 3,000 years since Sun Tzu and nearly two centuries since Carl von Clausewitz wrote "On War," the essence of war has been to break the enemy's will, giving precedence to the mental over the physical aspects of warfare. Clausewitz understood what Napoleon knew, war is mostly a mind game. Hamas, Hezbollah, even Iran know they cannot win a military contest against Israel, at least for now. They also know that in history's long run, victory on the battlefield can be irrelevant. Hamas and its supporters "won" this last round because they were rewarded with a victory in which Israel is more isolated than ever. Operationally, Israel cannot attack Iran with Hamas intact in Gaza and able to attack their southern flank.