Grant instructed General Butler, who had a large army at Fortress Monroe, to make Richmond his objective point. He instructed General Meade, commanding the Army of the Potomac, that Lee's army "would be his objective point, and wherever Lee went he would go also." He hoped to defeat and capture Lee, or to drive him back on Richmond, following close and establishing a connection with Butler's army there, if Butler had succeeded in advancing so far. Sherman was to move against Johnston's army, and Sigel, with a strong force, was to protect West Virginia and Pennsylvania from incursions. This, with plans for keeping all the other armies of the Confederacy so occupied that Lee could not draw from them, constituted the grand strategy of the campaign. The theatre of operations of the Army of the Potomac was a region of country lying west of a nearly north-and-south line passing through Richmond and Washington. It was about 120 miles long, from the Potomac on the north to the James on the south, and from 30 to 60 miles wide, intersected by several rivers flowing into Chesapeake Bay. The headquarters of the Union army were at Culpeper Court House, about 70 miles southwest of Washington, with which it was connected by railroad. This was the starting point. Lee's army was about fifteen miles away, with the Rapidan, a river difficult of passage, in front of it, the foothills of the Blue Ridge on its left, and on its right a densely wooded tract of scrub pines and various low growths, almost pathless, known as "the Wilderness." Two courses were open to Grant,--to march by the right, cross the upper fords, and attack Lee on his left flank, or march by the left, crossing the lower fords, and making into the Wilderness. Grant chose the latter way, as, on the whole, most favorable to keeping open communications. For General Grant, as commander of all the armies, was bound to avoid being shut up or leaving Washington imperiled. And it may properly be said here that his plan contemplated leaving General Meade free in his tactics, giving him only general directions regarding what he desired to have accomplished, the actual fighting to be done under Meade's orders.