The news of war liberates something in them that we can find no name for.
"The Desert of Wheat"
Zane Grey
It is the small amount of work required to turn the key which liberates an indeterminate quantity of potential energy.
"The Mechanism of Life"
Stéphane Leduc
Fortifications, like natural accidents of ground, serve to counterbalance superiority of numbers, or other disparity of means; both in land and sea warfare, therefore, and in both strategy and tactics, they are valuable adjuncts to a defence, for they constitute a passive reinforcement of strength, which liberates an active equivalent, in troops or in ships, for offensive operations.
"Lessons of the war with Spain and other articles"
Alfred T. Mahan