Energy may be likened to the bending of a crossbow; decision, to the releasing of a trigger.
Energy is both potential and kinetic. If you bend a bow, it has static but potential energy. When you release the bow, it has dynamic, kinetic energy. Your decision as to when you release the arrow will determine whether it hits its target or misses.
The bent bow is the readiness of your troops. The release bow leads quickly to them flowing in a rapid torrent over the enemy.