Enlisted 19 April 1861, Priv. Served Illinois Enlisted B Co. 7th Inf Reg. IL Mustered Out on 25 July 1861. Claimed residence in Springfield. [Source: Illinois: Roster of Officers and Enlisted Men]

From Civil War Records, National Archives.

Cornelius Ambrose, Sgt. , Company "F", 115 Regiment, Illinois Infantry.

Enlistment, Aug. 11, 1862, Shelby County, Illinois
August 11, 1862 - Joined for Duty, Camp Butler, Shelby County, Illinois
Age: 21 years, Height: 5', 11", Born in Champaign County, Illinois
Detailed with Pioneer Corps, April 7, 1863. Permanently transferred to U.S. V.V.E. July 27, 1864

September 13, 1862 - listed on Company Muster-In Roll
September 13 to October 31, 1862 - Present - Received one month's advance pay as private balance yet due.
November 1862 - Absent sick
December 31, 1862 - Absent from company, Left in Hospital Sick at Richmond, Kentucky, December 20, 1862
December 1862 - Absent det. serve Pioneer Corps July 1863
February 16, 1863 - Appointed 3rd Sergeant
April 7, 1863 - detailed with Pioneer Corps
Sept/October, 1863 - Company "D", 4th Battalion, Pioneer Brigade, present at Station at Carters Creek, Tennessee
November/December, 1863 - Company "D", 4th Battalion, Pioneer Brigade, present at Station at Ashton's Mill, Tennessee
January/February, 1864 - Absent
March/April, 1864 - Absent
May/June, 1864 - Absent
July/August, 1864 - Absent
July 27, 1864 - Transferred to U.S. V.V.E by order of Gen. Thomas
November 1864 - Transferred to 1 U.S. Veteran Volunteer Engineers - November 7, 1864, Chattanooga, Tennessee

Cornelius Ambrose, Sgt. Company "A", 1st Regiment, U.S. Veteran Volunteer Engineers.
Company Muster and Descriptive Roll dated Chattanooga, Tennessee, July 23, 1864.
Born in Champaign County, Ohio, age 23 years, occupation Blacksmith. Enlisted Aug 11, 1862 in Oconner, Illinois for a three year period. Eyes: hazel, Hair: Brown, Complexion: Dark, Height: 5', 11".

Mustered in Chattanooga, Sept. 13, 1864
November 1864 - Absent on Veteran furlough since Nov. 8. 1864
December 1864 - Absent without leave since December 18. 1864
January 1865 - Absent without leave since December 13, 1864.
June 11, 1865 - appears on Company Muster-out Roll, Camp Harker, Tennessee

Paradise, Enumerated 13 Jul 1860, 895/895
Cornelius Ambrose 19 M Blacksmith OH
Margaret 17 F IL
George W. Smith 19 M IN

• Married: 16 NOV 1859 in Mattoon, Paradise Twp., Coles County, Illinois ^{5 6 7}

1. Mary Elizabeth AMBROSE b: 7 NOV 1865 in Mattoon, Paradise Twp., Coles County, Illinois

1. Title: James Veregge , Descendants of Caleb Ambrose (Las Palma, CA, 15 Aug 1999)
   Page: Champaign County
2. Title: U.S. Federal Census (Provo, UT: Ancestry.com [images online],)
   Page: 1850ILM432_97-0194P96B
3. Title: James Veregge , Descendants of Caleb Ambrose (Las Palma, CA, 15 Aug 1999)
4. Title: U.S. Federal Census (Provo, UT: Ancestry.com [images online],)
   Page: 1860ilm653_171-0132-129
5. Title: Jordon Dodd of Liahona Research, compiler, Illinois Marriages, 1851-1900 (Provo, UT: MyFamily.com, Inc., 2005)
6. Title: Illinois Marriage Index 1763-1900 (http://www.sos.state.il.us/departments/archives/marriage.html)
   Page: B/195
7. Title: Church of Latter Day Saints, International Genealogical Index (www.familysearch.org)
   Page: Batch No.: M533822, Dates: 1849-1869, Source Call No.: 1301516