The military events that were transpiring in the meanwhile doubtless had their effect in hastening the decision and shortening the labors of Congress. To command the thirteen regiments of militia furnished by the State of Ohio, Governor Dennison had given a commission of major-general to George B. McClellan, who had been educated at West Point and served with distinction in the Mexican War, and who, through unusual opportunities in travel and special duties in surveys and exploration, had gained acquirements and qualifications that appeared to fit him for a brilliant career. Being but thirty-five years old, and having reached only the grade of captain, he had resigned from the army, and was at the moment serving as president of the Ohio and Mississippi Railroad. General Scott warmly welcomed his appointment to lead the Ohio contingent, and so industriously facilitated his promotion that by the beginning of June McClellan's militia commission as major-general had been changed to a commission for the same grade in the regular army, and he found himself assigned to the command of a military department extending from Western Virginia to Missouri. Though this was a leap in military title, rank, and power which excels the inventions of romance, it was necessitated by the sudden exigencies of army expansion over the vast territory bordering the insurrection, and for a while seemed justified by the hopeful promise indicated in the young officer's zeal and activity. His instructions made it a part of his duty to encourage and support the Unionists of Western Virginia in their political movement to divide the State and erect a Union commonwealth out of that portion of it lying northwest of the Alleghanies. General Lee, not fully informed of the adverse popular sentiment, sent a few Confederate regiments into that region to gather recruits and hold the important mountain passes. McClellan, in turn, advanced a detachment eastward from Wheeling, to protect the Baltimore and Ohio railroad; and at the beginning of June, an expedition of two regiments, led by Colonel Kelly, made a spirited dash upon Philippi, where, by a complete surprise, he routed and scattered Porterfield's recruiting detachment of one thousand Confederates. Following up this initial success, McClellan threw additional forces across the Ohio, and about a month later had the good fortune, on July 11, by a flank movement under Rosecrans, to drive a regiment of the enemy out of strong intrenchments on Rich Mountain, force the surrender of the retreating garrison on the following day, July 12, and to win a third success on the thirteenth over another flying detachment at Carrick's Ford, one of the crossings of the Cheat River, where the Confederate General Garnett was killed in a skirmish-fire between sharp-shooters.