By adding Maj. Gen. Richard S. Ewell's large division and Maj. Gen. Edward "Allegheny" Johnson's small division, Jackson increased his army to 17,000 men. He was still significantly outnumbered, but attacked portions of his divided enemy individually at McDowell, defeating both Brig. Gens. Robert H. Milroy and Robert C. Schenck. He defeated Banks at Front Royal and Winchester, ejecting him from the Valley. Lincoln decided that the defeat of Jackson was an immediate priority (though Jackson's orders were solely to keep Union forces occupied away from Richmond). He ordered Irvin McDowell to send 20,000 men to Front Royal and Maj. Gen. John C. Frémont to move to Harrisonburg. If both forces could converge at Strasburg, Jackson's only escape route up the Valley would be cut.