The Union forces at the front were about twice the corresponding forces of the South. Sherman, who commanded the river armies after Grant's transfer to Virginia, says: "I always estimated my force at about double, and could afford to lose two to one without disturbing our relative proportion." In Virginia the Army of the Potomac under Meade and the new Army of the James under Butler, both under Grant's immediate command, totaled over a hundred and fifty thousand men against the ninety thousand under Lee. These odds of five to three remained the same when a hundred and ten thousand Federals went into winter quarters against sixty-six thousand Confederates at Petersburg. But, when the naval odds of more than ten to one in favor of the North are added in, the general odds of two to one are reached on this as well as other scenes of action. In reserves the odds were very much greater; for while the South was getting down to its last available man the North began the following year with nearly one million in the forces and two millions on the registered reserve. Thus, even supposing that half the reserves were unfit for active service, the man-power odds against the South were these: two to one in arms at the beginning of the great campaign, five to one at the end of it, and ten to one if the fit reserves were all included. The odds in transportation by land, and very much more so by water, were even greater at corresponding times; while the odds in all the other resources which could be turned to warlike ends were greater still. The Southern situation, therefore, was not encouraging from the naval and military point of view. The border States had long been lost, then the trans-Mississippi; and now the whole river area was held as a base by the North. Only five States remained effective: Alabama, Georgia, the Carolinas, and Virginia. These formed an irregular oblong of about two hundred thousand square miles between the Appalachians and the sea. There were a good eight hundred Confederate miles from the Shenandoah Valley to Mobile. But the three hundred miles across the oblong, even in its widest part, were everywhere threatened and in some places held by the North. The whole coast was more closely blockaded than ever; and only three ports remained with their defenses still in Southern hands: Wilmington, Charleston, and Mobile. Alabama was threatened by land and sea from the lower Mississippi and the Gulf. Georgia was threatened by Sherman's main body in southeastern Tennessee. The Carolinas were in less immediate danger. But they were menaced both from the mountains and the sea; and if the Union forces conquered Virginia and Georgia, then the Carolinas were certain to be ground into subjugation between Grant's victorious forces on the north and Sherman's on the south.