Statistics for occurrence #1 of “General Thayer” in chapter 13, page 519 of William F. Fox, Lt. Col. U. S. V., Regimental Losses in the American Civil War, 1861-1865: A Treatise on the extent and nature of the mortuary losses in the Union regiments, with full and exhaustive statistics compiled from the official records on file in the state military bureaus and at Washington:

...864. Williamson's Iowa Brigade, of the Fifteenth Corps, was composed of the 4th, 9th, 25th, 26th, 30th, and 31st Regiments, and was a splendid command. It was organized in December, 1862, with General Thayer in command, who was succeeded soon after the Vicksburg campaign by Colonel James A. Williamson of the 4th Iowa. General Williamson having been mustered out in February, 1865, he was succeeded by Colo...
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