Major John Alexander Harman
Of General Jackson, John Imboden wrote: "I never knew him to let profanity pass without a rebuke but once. The incident was reported to me by the chief actor in it, Major John A. Harman, who was Jackson's chief quartermaster, and a man of extraordinary qualifications. It happened at Edwards Ferry, on the Potomac, when our army was crossing into Maryland in the Antietam campaign. Major-General D. H. Hill's division was crossing, when Jackson rode up, and found the ford completely blocked with Hill's wagon-train. He spoke sharply to Hill (who was his brother-in-law, they having married sisters) for allowing such confusion. General Hill replied that he was not a quartermaster, or something that implied it was no part of his business to get tangled wagons out of the river. Jackson instantly put Hill in arrest, and, turning to Major Harman, ordered him to clear the ford. Harman dashed in among the wagoners, kicking mules, and (the) apparently inextricable mass of wagons, and, in the voice of a stentor, poured out a volume of oaths that would have excited the admiration of the most scientific mule-driver. The effect was electrical. The drivers were frightened and swore as best they could, but far below the Major's standard. The mules caught the inspiration from a chorus of familiar words, and all at once made a break for the Maryland shore, and in five minutes the ford was cleared. Jackson witnessed and heard it all. Harman rode back to join him, expecting a lecture, and, touching his hat, said: 'The ford is clear, General! There's only one language that will make mules understand on a hot day that they must get out of the water.' The General, smiling, said: 'Thank you, Major,' and dashed into the water at the head of his staff."
Imboden, John D., Incidents of the Battle of First Manassas, The Century Magazine, 1885-05-01