The efforts of the North to crush the rebel forces in Virginia had signally failed. But military operations were not confined to Virginia: in this war the battle-field was the continent. Many hundreds of miles from the scene of M’Clellan’s unsuccessful efforts, the banner of the Union was advancing into the revolted territory. The North sought to occupy the Border States, and to repossess the line of the Mississippi, thus severing Texas, Louisiana, and Arkansas from the other members of the secession enterprise, and perfecting the blockade which was now effectively maintained on the Atlantic coast. There were troops enough for these vast operations. By the 1st of December 1861, six hundred and forty thousand men had enrolled themselves for the war. The North, thoroughly aroused now, had armed and drilled these enormous hosts. Her foundries worked night and day, moulding cannon and mortars. Her own resources could not produce with sufficient rapidity the gunboats which she needed to assert her supremacy on the western waters, but she obtained help from the building-yards of Europe. All that wealth and energy could do was done. While the Confederates were supinely trusting to the difficulties of the country and the personal prowess of their soldiers, the North massed forces which nothing on the continent could long resist. In the south and west results were achieved not unworthy of these vast preparations. [Sidenote: 1861 A.D.] During the autumn a strong fleet was sent southward to the Carolina coast. Overcoming with ease the slight resistance which the rebel forts were able to offer, the expedition possessed itself of Port Royal, and thus commanded a large tract of rebel territory. It was a cotton-growing district, worked wholly by slaves. The owners fled, but the slaves remained. The first experiment was made here to prove whether the negro would labour when the lash did not compel, and the results were most encouraging. The negroes worked cheerfully and patiently, and many of them became rich from the easy gains of labour on that rich soil. In the west the war was pushed vigorously and with success. To General Grant--a strong, tenacious, silent man, destined ere long to be Commander-in-Chief and President--was assigned the work of driving the rebels out of Kentucky and Tennessee. His gunboats ran up the great rivers of these States and took effective part in the battles which were fought. The rebels were forced southward, till in the spring of 1862 the frontier line of rebel territory no longer enclosed Kentucky. Even Tennessee was held with a loosened and uncertain grasp. [Sidenote: March 1862 A.D.] In Arkansas, beyond the Mississippi, was fought the Battle of Pea Ridge, which stretched over three days, and in which the rebels received a sharp defeat. Henceforth the rebels had no footing in Missouri or in Arkansas.