In 1870, a Charles Bournonville was living in the 13th ward of Philadelphia, accdording to the 1870 US census (38th district, page 347). He was born in France, and was 63 years old. He is pretty clearly the Charles Bournonville in Alain Bournonville's database (13). He was born to Antoine Bournonville and Louise Sandberg (12, 13). He died in San Francisco (13). His half-brother August Bournonville was living in Philadelphia in 1860 and 1870 (11, 13; 1860 US census 12th ward 1st division, page 70; 1870 US Census Philadelphia PA 3th ward 38th district page 346; see also 1900 census Philadelphia PA 29th ward e.d. 709 p.85A).
If this Charles is the same person as the Charles who served in the 91st Pennsylvania, the age in the regimental records is surprisingly wrong.
He was 18 years old when he was enlisted (6). He was born in Philadelphia, Pennsylvania (6).
He was 5 feet 6-1/2 inches tall, and had a dark complexion, brown eyes, and brown hair (6).
He was enlisted and mustered into service on 20 August 1861 (1, 6, 7, 9). He was enlisted for three years, at Philadelphia, Pennsylvania, by Colonel Reiff (6, 7 [Lt Col]). He served in company C (1).
He was appointed corporal on 21 September 1861 (3, 4).
He was discharged on 12 February 1863 on surgeon's certificate of disability, at Falmouth, Virginia (1, 2, 5, 7, 9). He was then a corporal (1, 2).
He was a member of Nebraska Grand Army of the Republic post 227, in Chadron, Dawes County, Nebraska (8).
On 14 October 1882, he applied unsuccessfully for a pension, from Dakota (9, 10).
He died on 26 September 1897 (11). He was buried at Highland Cemetery, Great Falls, [Cascade County,] Montana (11).
1 Bates, Samuel Penniman. History of Pennsylvania volunteers, 1861-5. Harrisburg: B. Singerly, state printer, 1869-71. 5 volumes. 'Ninety-first regiment', volume 3, pages 186-233. (C Bournonville) (In the roster)
2 consolidated morning report, 13 February 1863 (Chas Bournonvill)
3 company C, List of non-commissioned officers, page 1, corporals (Chas Bournonville)
4 company C, List of non-commissioned officers, page 2, corporals (Chas Bournonville)
5 company C, register of men discharged, number 15 (Charles Bournonville)
6 company C, descriptive roll, number 13 (Charles Bournonville)
7 company C, untitled list, probably of status at muster out, entry 10 (Charles Bournonville)
8 Nebraska GAR membership index, searched 30 December 2004 (Charles Bournonville)
9 pension index, by regiment, 91st PA Infantry, company C (Charles E Bournonville)
10 pension index, by name (Charles E Bournonville)
11 burial information (supplied by Alain Bournonville) (Charles Bournonville)
12 e-mail, Alain Bournonville to Harry A Ide, January 2009 (Charles Bournonville)
13 Informations généalogiques (by Alain Bournonville) (viewed January 2009) (Charles E Bournonville)
[I did not find an entry for him in the index on <www.ancestry.com> to the 1890 veteran's census (searched June 2007)]