Johnson left Washington, D.C. just before Congress adjourned. He raised one thousand men, nominally part of the Kentucky militia under Governor Isaac Shelby, but largely operating independently. He disciplined his men, required that every man have arms in prime condition and ready to hand, and hired gunsmiths, blacksmiths, and doctors at his own expense. He devised a new tactical system: when any group of men encountered the enemy, they were to dismount, take cover, and hold the enemy in place. All groups not in contact were to ride to the sound of firing, and dismount, surrounding the enemy when they got there. Between May and September, Johnson raided throughout the Northwest, burning the war supply centers of Indian villages, surrounding their fighting units and scattering them, killing some warriors each time.