As a loyal Unionist, he was imprisoned by Confederate authorities following the surrender of U.S. troops by Maj. Gen. David E. Twiggs.
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In December 1863 he was nominated for promotion to brigadier general with an effective date of July 23, 1863, commemorating the end of the pursuit of Lee's Army of Northern Virginia.
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In 1855, Garrard was transferred to the 2nd U.S. Cavalry as an adjutant to Colonel Albert Sidney Johnston and Lieutenant Colonel Robert E. Lee, both future generals in the Confederate States Army.
He was a grandson of Kentucky Governor James Garrard and cousin of Israel Garrard, Jeptha Garrard, and Kenner Garrard.
Kenner, Louisiana | Kenner | Garrard baronets | Sir Samuel Garrard, 4th Baronet | Rose Garrard | Kenner Garrard | James Garrard | Hugh Kenner | David Garrard | ''Hand of Peace'', a sculpture by artist Rose Garrard | George Kenner | Garrard Transcription Turntable | Garrard & Blumfield | Garrard Ardeneum | Edward Garrard Marsh |
When the Civil War began, he became a war correspondent, then declined a commission in 1862 to become a staff aide to Andrew Johnson, military governor of Tennessee, and Generals James S. Negley, John H. King and Kenner Garrard.