- He served as a Sergeant in in the CSA: first, in the 7th Regiment of the Kentucky Cavalry; then, from August 1863 to the end of the war, in the 2nd Battalion of the Kentucky Cavalry (Dortch's). He is included on the Civil War page.
His war records themselves show a bit more than this, including for specific Muster Rolls and his surrender.
He was enlisted at Millersburg, KY by Capt. Gano on Sept. 9, 1862, for a period of 3 years. He appears in Co. F of the 7 Kentucky Cavalry on an undated slip. On another undated slip, he appears on a "List of officers and men" belonging to Company B of the 2nd Battalion Kentucky Volunteers--"Dortch's Battalion, Williams' Command."
Muster roll slips show him present from Oct. 8 to Nov. 1, 1862 as a 4th Sgt. in Co. F of Gano's 2nd Regiment of Kentucky Cavalry. He is paid at the end of the time for 1 mo. and 22 days. Then, slips show him present as a 3rd Sgt. in Co. F of the 3rd Regiment of Kentucky Cavalry from Nov 1862 through to Aug. 31, 1863. After this, he is present on Sept. & Oct. 1863 for Company A of the 2nd Battalion.
Putting this together, it seems that he would have been first recruited by Gano, who had formerly been head of a company of a Texas Cavalry Battalion. It would seem that he first served with Gano for a couple of months in the 7th Cavalry, Company F. He appears here in the Adjutant General's report, though no enlistment date or place are given. This company disbanded after Morgan's June-July 1863 raid through Ohio--one notable instance of a Confederate raid into U.S. territory.
Mannen switched to the 3rd regiment, however, well before the raid. The 3rd regiment was organized in the summer of 1862. He is present in it from Nov. 1862 through to August of 1863. According to Crute's regimental history, this unit skirmished in numerous actions in Tennessee, Kentucky, and Georgia. Later in the war the unit was active in the Atlanta Campaign, the defense of Savannah, and the campaign of the Carolinas.
I wonder, however, if this is confused. The Roll of Company A of the 2nd Battalion Cavalry in the Adjutant General's report shows him as a 3rd Sergeant, but as enlisting on Sept. 9, 1862, at Millersburg, KY. L.A. Humber is listed as the Company's Captain; John B. "Dorch" is the "Capt. Comdg."
In Sept. and Oct. of 1863 his rosters show him in Dortch's 2nd Battalion was consolidated in August 1863, partly from what was left of Morgan's command after his summer raid through Ohio. He is present in it for two months. This regiment fought a series of engagments in Kentucky, Tennessee, and Virginia; it disbanded in Jan. of 1865 because so few men were left.
This can't be the whole story, however, because Mannen surrendered in Georgia as a member of the 3rd Regiment (see below). He was in Dortch's for an unspecified whle, but he left it at some (unrecorded) point to rejoin the 3rd Regiment.
Note that Edward Guerrant mentions him briefly in his diary for 27 March 1865: "Met Leslie Manning today, a roommate & College mate at Danville, a member of Duke's Brigade." Guerrant was in Eastern Tennessee at the time.
According to his record, as a member of the 3rd Regiment of the Kentucky Cav. he took the Oath of Allegiance to the U.S. "subscribed and sworn to before. W.H. Bracken, 1st Lieut. and Asst. Pro. Mar. Genl., Dept. Cumb., at Nashville, Tennessee May 22, 1865." He is described here as from Mason Co., Ky; as with a dark complexion, brown hair, hazel eyes, 5'10" tall. He surrendered on May 9, 1865, at Washington, Georgia. He did not file for a pension, or at least no-one did in his name.
When the War ended he was 23 years old. The Marriage Book at Mason County says that he was 27 when married, and Sallie Pollock was 21; both are listed as from Mason County; Leslie Mannen is described as a farmer; their Bondsman is William H. Pollock, presumable Sallie's older brother; and they are to be married "at the residence of Dr. Isaac Pollock, Mason Co., Ky on 4th day of November 1869." (See "MARRIAGES: Marriage County, KY - Marriage Abstracts 10, 1868-1873" at the Mason Co., Kentucky USGenWeb.) There is also a Leslie Mannen who married a Lucretia Hamilton. The correspondence in names is remarkable, but I don't know what to make of it.
The family is listed in the 1880 census for Germantown, Mason Co.; he was a farmer. His family had been tobacco farmers for decades. Both his parents were born in Kentucky.
On 13 January 1887, a notice appeared in the Daily Evening Bulletin in Maysville that "'Squire Leslie Mannen, of Germanton, has returned from Cincinnati, where he went to consult a physician as to the injury to one of his eyes, caused by a ball from a Roman cancle Christmas night. The doctor, who is a prominent oculist, gave him no encouragement. The burn was more severe than it was at first thought to be, and has resulted in the complete loss of sight in the injured eye" (found at http://chroniclingamerica.loc.gov/). I'm not sure why he is called "'Squire" here? It might be another one?
On 22 Aug. 1887 a notice appeared in the Daily Evening Bulletin in Maysville that "Emma Browning has sold to L.H. Mannen one hundred acres of land on Bracken Creek for $3,500. Part of the land is in Mason and part in Bracken County" (found at http://chroniclingamerica.loc.gov/).
He moved to Galena, Kansas in about 1895 with his family after the family farm played out or went broke. In 1900 the family appears on the census in Galena, Cherokee Co., Kansas; two of his sons are working in the zinc mines; the other two are clerks; and May is in school. Why did they go to Kansas? There are other Mannens out there, though I see none in Galena itself.
Family history has it that he was a substantial citizen--well off, and perhaps a member of the state legislature, but that he drank himself to death. That he was at least interested in state office is confirmed by his obituary, which says that he ran for county commissioner while living in Galena, Kansas in 1898. The obituary also confirms he was an alcoholic, mentioning that he died of cirrhosis of the liver; it also cryptically mentiones that "As has been the case with many others, his worst enemy was himself." This was a disease that he seems to have passed on to one or more of his male children. [6, 7, 8, 9]