Garfield's army life was begun with no other military knowledge than such as he had hastily gained from books in the few months preceding his march to the field. Stepping from civil life to the head of a regiment, the first order he received when ready to cross the Ohio was to assume command of a brigade, and to operate as an independent force in Eastern Kentucky. His immediate duty was to check the advance of Humphrey Marshall, who was marching down the Big Sandy with the intention of occupying, in connection with other confederate forces, the entire territory of Kentucky, and of precipitating the State into secession. This was at the close of the year 1861. Seldom, if ever, has a young college professor been thrown into a more embarrassing and discouraging position. He knew just enough of military science, as he expressed it himself, to measure the extent of his ignorance, and with a handful of men he was marching, in rough winter weather, into a strange country, among a hostile population, to confront a largely superior force under the command of a distinguished graduate of West Point, who had seen active and important service in two preceding wars. The result of the campaign is matter of history. The skill, the endurance, the extraordinary energy shown by Garfield, the courage he imparted to his men, raw and untried as himself, the measures he adopted to increase his force and to create in the enemy's mind exaggerated estimates of his numbers, bore perfect fruit in the routing of Marshall, the capture of his camp, the dispersion of his force, and the emancipation of an important territory from the control of the rebellion. Coming at the close of a long series of disasters to the Union arms, Garfield's victory had an unusual and extraneous importance, and in the popular judgment elevated the young commander to the rank of a military hero. With less than two thousand men in his entire command, with a mobilized force of only eleven hundred, without cannon, he had met an army of five thousand and defeated them--driving Marshall's forces successively from two strongholds of their own selection, fortified with abundant artillery. Major-General Buell, commanding the Department of the Ohio, an experienced and able soldier of the regular army, published an order of thanks and congratulation on the brilliant result of the Big Sandy campaign, which would have turned the head of a less cool and sensible man than Garfield. Buell declared that his services had called into action the highest qualities of a soldier, and President Lincoln supplemented these words of praise by the more substantial reward of a brigadier-general's commission, to bear date from the day of his decisive victory over Marshall.