We can actually learn a lot about some of Satan's strategies in spiritual warfare by studying the military strategies of some of the warriors of old. In his book Head Game, author Tim Downs writes:

Psy-ops stands for Psychological Operations, a form of warfare as old as the art of war itself. An early example of this can be found in the battle strategies of Alexander the Great. On one occasion when his army was in full retreat from a larger army, he gave orders to his armorers to construct oversized breastplates and helmets that would fit men 7 or 8 feet tall. As his army would retreat, he would leave these items for the pursuing army to discover. When the enemy would find the oversized gear, they would be demoralized by the thought of fighting such giant soldiers, and they would abandon their pursuit.

Satan likes to play head games with us, too, often leaving us demoralized by fear or doubt. We assume Satan is bigger or greater than he really is. And the quickest way to thwart our Enemy's psy-ops is to gaze upon the greatness of our God.