Taking a map of Kentucky, Buell briefly showed Garfield a problem, and told him to solve it. In a word, the question was, how shall the Confederate forces be chased out of Kentucky? The rebels badly needed Kentucky; so did the Union. Having shown Garfield what the business was, Buell told him to go to his quarters for the night, and at nine o’clock next morning be ready to submit his plan for a campaign. Garfield immediately shut himself up in a room, with no company but a map of Kentucky. The situation was as follows: Humphrey Marshall, with several thousand Confederate troops, was rapidly taking possession of eastern Kentucky. Entering from Virginia, through Pound Gap, he had quickly crossed Pike County into Floyd, where he had fortified himself, somewhere not far from Prestonburg, and was preparing to increase his force and advance farther. His present situation was at the head of the Big Sandy River. Catlettsburg, where the Forty-second had gone, is at the mouth of this river. Also, on the southern border, an invasion from Tennessee was being made by a body of the Confederates, under Zollicoffer. These were advancing toward Mill Spring, and the intention was that Zollicoffer and Marshall should join their forces, and so increase the rebel influence in the State that secession would immediately follow. For Kentucky had refused to secede, and this invasion of her soil was a violation of that very cause of State’s Rights for which they were fighting. Garfield studied this subject with tireless attention, and when day dawned he was also beginning to see daylight. At nine o’clock he reported. The plan he recommended was, in substance, that a regiment be left, first, some distance in the interior, say at Paris or Lexington, this mainly for effect on the people of that section. The next thing was to proceed up the Big Sandy River against Marshall, and run him back into Virginia; after which it would be in order to move westward, and, in conjunction with other forces, keep the State from falling into hostile hands. Meanwhile, Zollicoffer would have to be taken off by a separate expedition. Buell stood beside his young Colonel and listened. He glanced at the outline of the proposed campaign and saw that it was wisely planned. As a result—for Buell did nothing hastily—Colonel Garfield was told that his instructions would be prepared soon, and he might call at six that evening. That evening he came, and learned the contents of Order No. 35, Army of the Ohio, which organized the Eighteenth Brigade, under the command of James A. Garfield, Colonel of the Forty-second O. V. I. The brigade itself was made up of the last-named regiment, the Fortieth O. V. I., Colonel J. Cranor; Fourteenth K. V. I., Colonel L. D. F. Moore; Twenty-second K. V. I., Colonel D. W. Landsay, and eight companies of cavalry. Buell’s instructions were contained in the following letter: “HEADQUARTERS DEPARTMENT OF THE OHIO, Louisville, Ky., Dec. 17, 1861.