But Pope had not been idle or inattentive during these pregnant days. As soon as Jackson's descent upon his supply depots was made known to him, he abandoned his position on the Rappahannock and fell back to try conclusions on the historic field of Manassas. Having received still further reinforcement from McClellan, his army now slightly exceeded Lee's in numbers and considerably exceeded it in other elements of strength. Accordingly, being a commander of great enterprise and vigor, he at once assailed Lee at Manassas in full force. For two days he hurled his heavy battalions upon the Confederates, severely taxing and testing their resisting power. For these were armies of veteran, battle-seasoned soldiers that were fighting each other now, and not the raw levies of a year before. They fought with order and system and their minds were open to no such panic impulses as those that had put McDowell to rout and reduced what had been placed under his command as an army to the condition of an insanely frightened mob. But on the other hand the Southerners were commanded now not by a pair of inexperienced ex-captains of the Engineer Corps, but by Robert E. Lee himself, with Stonewall Jackson and James Longstreet and R. S. Ewell and the two Hills for his lieutenants. The attack was determined; the defense obstinate; the fighting heroic; the result bloody in an extreme degree. The field was contested for two days with a heroic stubbornness on either side which showed clearly how great a change had been wrought in the conditions of the war by the disciplining of the troops, by their experience in the brutally bloody work of war, and by the training such experience had given to their officers. The end of it was that Lee drove Pope across Bull Run and back to Centreville. Immediately he followed up his victory as Johnston and Beauregard had not done a year before on the same field. He turned the position at Centreville and compelled Pope to retreat hurriedly, but in tolerably good order, upon Washington. It was in this conflict that a gallant and hard-fighting Federal general, Fitz-John Porter, had the ill luck to encounter criticism which resulted in his trial by court martial and his dismissal from the army in disgrace. It was not until many years afterwards that the actual facts of the fighting were clearly and convincingly made known with the result of relieving General Porter of the stigma he had so long unjustly borne, and rehabilitating his high reputation in the minds of his countrymen. The story of it all is one of pitiable and long-continued suffering under misapprehension and falsehood. It is fully told in other publications than this, and it has no proper place except that of casual mention, in a simple chronicle of events such as the present work is. CHAPTER XXX LEE'S FIRST INVASION OF MARYLAND