 Complete the following phrase:  Hallecks department performed well in early 1862, driving the Confederates from the state of Missouri and advancing into Arkansas. They held all of West Tennessee and half of Middle Tennessee. Grant, not yet aware of the political maneuvering behind his back, regarded Halleck as one of the greatest men of the age and Maj. Gen. William T. Sherman described him as the directing genius of the events that had given the Union cause such a tremendous lift in the previous months. This performance can be attributed to Hallecks strategy, administrative skills, and his good management of resources, and to the excellent execution by his subordinatesGrant, Maj. Gen. Samuel R. Curtis at Pea Ridge, and Maj. Gen. John Pope at 