Statistics for occurrence #1 of “General Heintzelman” in entry stoneman-george of Harper's Encyclopedia of United States History:

...and chief of cavalry, in August. He was active in the Peninsular campaign in 1862; and after the fall of General Kearny, at Chantilly, he took command of that general's division. He succeeded General Heintzelman as commander of the 3d Army Corps, which he led in the battle of Fredericksburg, and was promoted to major-general in November, 1862. In the Richmond campaign, in May, 1863, he commanded a cavalry ...
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