If you say that someone or something unleashes a powerful force, feeling, activity, or group, you mean that they suddenly start it or send it somewhere. Then he unleashed his own, unstoppable, attack The officers were still reluctant to unleash their troops in pursuit of a defeated enemy
release or vent; "unleash one's anger" turn loose or free from restraint; "let loose mines"; "Loose terrible plagues upon humanity" release from a leash; "unleash the dogs in the park