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The 3rd Iowa Infantry was organized at Keokuk, Iowa and mustered into Federal forces on June 8, 1861. The regiment was consolidated into a battalion of three companies in July, 1864 after those members of the regiment who did not reenlist mustered out and the survivors were transferred to 2nd Regiment Iowa Volunteer Infantry as Companies "A," "F," and "I" on November 4, 1864.
http://en.wikipedia.org/wiki/3rd_Iowa_Volunteer_Infantry_Regiment