Statistics for occurrence #1 of “Col. Robert E. Lee” in alphabetic letter T, entry group 3, entry thomas-george-henry of Harper's Encyclopedia of United States History:

...Point, and was made major of cavalry in May, 1855. From 1856 to 1860 he served in Texas, and in a fight with the Indians near Brazos River was wounded. He was promoted colonel of the 5th Cavalry ( Col. Robert E. Lee 's old regiment) in May, 1861; and, having served awhile in the vicinity of the upper Potomac, was made brigadiergeneral of volunteers in August. From November, 1861, till March, 1862, he commanded ...
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