Though both parties have claimed resounding victories, the fog of war still hangs heavy in Nagorno-Karabakh. We can draw informed conclusions about the tactics used in the fighting, but a more complete appraisal of the conflict will have to wait for the two countries' widely diverging assessments of territory gained and casualties inflicted to be reconciled. Still, that will not stop Armenia and Azerbaijan from drawing military lessons from the past few days of fighting. Their conclusions will be important because the cease-fire will not endure....