On the 28th of June, Gen. Hooker, at his own request, was relieved from the command of the Federal army, and Gen. Meade, whose antecedents were those of an efficient corps and division commander, was appointed to succeed him. A great alarm pervaded the North. The Governors of Ohio, Pennsylvania, New York, Maryland, and Western Virginia called out their militia forces. But these feverish displays were of little consequence. It was easily seen by the intelligent that the security of the North rested upon Meade's army, and on the strongly fortified lines of Washington, and that if this array was once broken, hastily levied militia could afford no protection against Lee's army, and that thus the war was about to culminate in a grand contest of regular arms. It was a sharp, fearful issue. Gen. Meade found himself in command of a splendid army of about one hundred and fifty thousand men. He comprehended the necessity of rapid and decisive action. Rapidly organizing his forces, he marched out to meet the Confederates. Making a disposition of his forces so as to cover both Washington and Baltimore at the same time, he moved forward cautiously until his advance reached Gettysburg. About one mile from the town, a line of entrenchments was thrown up on a range of hills, and a heavy force moved forward through and beyond the town to watch the movements of his adversary.