One record names him 'McKnight' (35).
He was 48 years old when he was enrolled (30, 42 [53 at death in 1867]). He was born in Philadelphia, Pennsylvania (42).
In 1860, he may have been living in Philadelphia, Pennsylvania, in ward 16 (31). (See my note below about the Dr Isaac Knight in Rootsweb WorldConnect.) This Isaac Knight was 46 years old, and had been born in Mexico (31). He owned $23,000 in personal property (31). He was living with eight people, presumably his wife and seven children (31):
He was living in Philadelphia, Pennsylvania, when he was enrolled (30).
He was enrolled on 24 October 1861, at Philadelphia, Pennsylvania (30). He was mustered into service as surgeon on 7 November 1861 at Philadelphia, Pennsylvania (1, 13, 30 [4 Nov 61]).
In November 1861, he acknowledged receiving supplies from the Union Relief Association of Philadelphia (39).
One of his tasks as surgeon was to sign death certificates. For example, on 20 February 1862, he signed a death certificate for William Willis (43). Another was to sign certificates of disability. About 5 April 1862, he signed one for Peter Herder, who had been accidentally injured by a mule (37). And on 23 August 1862, he signed one for William Whitman, who died of typhoid fever.
On 29 June 1862, he, along with the other commissioned officers in the regiment (except Colonel Gregory), signed a statement denying accusations that they were on the verge of open mutiny, that the regiment had been reduced to 400 men, and that Colonel Gregory was too lenient to Confederates and too harsh to men in the regiment (38).
On 19 August 1862, he testified at the court-martial of E Carroll Brewster (36). His testimony was not helpful to Brewster (36). He had prescribed treatment for neuralgia and neuralgic rheumatism, perhaps six times in the previous three weeks (36). And on the day Brewster was accused of being drunk on duty, he had prescribed Dover's Powder, composed of opium and ipecacuahana, to be taken once in three hours (36). But he testified that Brewster's condition should not have caused him to stagger, and Dover's Powder would not cause him to appear drunk (36). Perhaps because he was so unhelpful, Brewster's counsel questioned him only briefly, and the judge advocate who was prosecuting Brewster did not cross-examine him (36).
On 7 February 1863, he was acting medical director (14).
He was the division's Medical Director at the Battle of Chancellorsville (15).
On 25 May 1863, he went on a five-day leave (21). He was still reported absent with leave on 2 June (22), but had returned by 3 June (23).
On 22 June 1863, the regiment received a special order from Brigade Headquarters assigning him as surgeon-in-chief of the brigade if an engagement occurred (17). He was present, as surgeon, at Gettysburg on 2 July 1863 (4, 7). He was serving at the division hospital, and was ordered to return to the regiment on 6 July 1863 (20). On 2 August 1863, he was relieved from duty as surgeon in chief, because of disability (18).
He was a witness to the charges and specification Joseph Sinex filed against Morris Kayser, and testified in his court-martial (20).
On 4 August 1863, he was ordered (by special order 207, headquarters, Army of the Potomac) to report to Washington for medical treatment (19, 25). He left on 5 August 1863 (8). On 24 August 1863, he received a medical certificate at Philadelphia, which recommended leave for 20 days (8, 16). The leave was to expire on 13 September 1863 (8). It was extended for 20 days on 12 September 1863 (26). It expired on 2 October 1863 (27), but was extended for 20 days on 1 October 1863 (28). He had returned by 23 October 1863 (29).
Private Bender of company G [either Jacob Bender or John Bender] was ordered to report to him on 16 December 1863, to nurse Captain Faust, who died two days later (9). And Philip Toushant (co.I) was detailed as hospital nurse on 19 December 1863, and ordered to report to him immediately (10).
He reenlisted as surgeon at Bealton, Virginia, on 26 December 1863 (30).
On 26 January 1864, he examined George Rodearmal and approved his enlistment (24).
On 2 March 1864, he placed Francis Gregory in the hospital at Chester Pennsylvania (11).
Henry McKane (C) was detailed as hospital nurse and ordered to report to Knight on 23 March 1864 (12).
He was reported transfered as Assistant Surgeon of Volunteers on 17 April 1864 (34).
He was discharged on 18 July 1864 (1, 30) or 15 April 1864 (2) by special order [unknown number], War Department, dated 21 April 1864 (13).
He was married to Ann C [unknown surname] (32).
When he died, he was living at 1822 Hamilton Street, Philadelphia, Pennsylvania (33, 42).
He died suddenly, on Sunday, 13 January 1867, at Philadelphia, Pennsylvania, of disease of the heart (3, 33, 42). The funeral was held from his residence, at 10 AM, on 16 January 1867 (33, 42). The services were at the Cathedral, at 11 AM (33). He was buried at the Cathedral Cemetery (42).
Ann C Knight, his widow, applied successfully for a pension on 2 December 1869 (3, 32).
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. (In the roster)
3 pension index, by regiment (Isaac D Knight)
4 letter, Sinex to Marvin, 2 Aug 1863
5 Welch, p.501
6 newspaper accounts of the 91st's arrival in Philadelphia on veterans' furlough
7 Pennsylvania Memorial, Gettysburg, Pennsylvania
8 letter, Sinex to Marvin, 7 September 1863
9 special order 116, HQ 91st PA, 16 December 1863
10 special order 119, HQ 91st PA, 19 December 1863
11 letter, Gregory to Bennett, 16 June 1864
12 special order 24, HQ 91st PA, 23 March 1864
13 Regimental descriptive book
14 consolidated morning report, 7 February 1863
15 report of A A Humphreys, commanding 3rd division, 5th corps, of the battle of Chancellorsville, 10 May 1863
16 letters received, #17, received 27 August 1863, dated 24 August 1863; #29, received 18 September 1863, dated 12 September 1863; #36, received 4 October 1863, dated 1 October (Isaac D Knight)
17 special orders received, #2, received 22 June 1863 (Surg Knight)
18 special orders received, #7, received 2 August 1863 (Surg Knight)
19 special orders received, #8, received 4 August 1863 (Surg Knight)
20 record of Morris Kayser's court martial
21 consolidated morning report, 91st PA, 25 May 1863 (I D Knight)
22 consolidated morning report, 91st PA, 2 June 1863 (not named)
23 consolidated morning report, 91st PA, 3 June 1863 (not named)
24 enlistment paperwork, George Rodearmal (I D Knight)
25 consolidated morning report, 91st PA, 8 August 1863 (Surg. Knight)
26 consolidated morning report, 91st PA, 19 September 1863 (Surg Knight)
27 consolidated morning report, 91st PA, 4 October 1863 (Surg Knight)
28 consolidated morning report, 91st PA, 5 October 1863 (Sur Knight)
29 consolidated morning report, 91st PA, 23 October 1863 (Surg. I.D. Knight)
30 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 5 May 2004 (Isaac D Knight)
31 1860 United States census, Pennsylvania, Philadelphia County, ward 16, east division, page 38 line 38 through page 39 line 6 (Isaac Knight)
32 pension index, by name (searched 21 May 04, on Ancestry) (Isaac D Knight)
33 [death notice], Philadelphia Inquirer 15 January 1867, page 5 (also published on 16 January 1867 page 4) (Isaac D Knight)
34 consolidated morning report, 91st Pennsylvania, 17 April 1864 (Surg Knigt)
35 company G, register of men discharged (Regt Surg McKnight)
36 court-martial record, E Carroll Brewster (Isaac D Knight)
37 [Peter Herder], Serial Set volume 1668, session volume 2, 44th Congress, 1st session, Senate Report 452] (J [sic] D Knight)
38 'Ninety-first Pennsylvania Regiment'. Philadelphia Inquirer, 11 July 1862, page 2 (J D Knight)
39 'Acknowledgement', Philadelphia Inquirer 25 November 1861 page 8 (J D Knight)
40 'Camp Chase', Philadelphia Inquirer 30 November 1861 (J D Knight)
41 'Departure of Col. Gregory's regiment', Philadelphia Inquirer 22 January 1862 page 2 (J D Knight)
42 death certificate, Philadelphia, Pennsylvania, 13 January 1867 (Isaac Donaldson Knight)
43 death certificate, Philadelphia, Pennsylvania, 19 February 1862, William S Willis (Isaac D Knight)
[Two gedcoms on Rootsweb WorldConnect ('Descendants of the Cheltenham, Penna Shoemakers and related families' last revised 30 Apr 2006 contact Jerry Zollars, and 'Eric & Leigh Morris Marvin family' last revised 1 May 2003 contact Leigh Marvin) have an Isaac D Knight who might be this Isaac Knight. He was born on 6 September 1813, to Abel Knight and Elizabeth Donaldson, married Ann Catharine Hoff in Galveston, Galveston County, TX on 11 November 1838, and had five children (Henry B Knight, Catharine N Knight, Carlos W Knight, Mary E Knight, and Bernardo Hoff Knight, all born in Texas)]
[I have not found Isaac Knight in the 1850 census, and have not found his wife (under Ann or May Knight) in the 1870 census.]
[I did not find an entry for him in Ancestry's index to the 1890 veterans' census (searched October 2005)]
Applicant enlisted August 6, 1861, at Galesburgh, Mich., for three years, [...] and was honorably discharged about April 5, 1862, at Washington, D.C., on certificate of disability, signed by Surgeons N. F. Marsh, Fourth Pennsylvania Cavalry, and J. [sic] D. Knight, Ninety-first Pennsylvania Volunteers, cause of disability being loss of the use of his left arm, from fracture of the neck of the scapula, and dislocation of the humerus, caused by the upsetting of a wagon, one of the mules of which he was driving falling upon him and crushing him as above stated.
KNIGHT.--Suddenly, on Sunday, 13th instant, in the 54th year of his age, Dr. ISAAC D. KNIGHT, late Surgeon United States Volunteers.
The relatives and friends are invited to attend the funeral, from his late residence, No. 1822 Hamilton street, at 10 o'clock A.M., Wednesday, 16th instant, without further notice. Service at the Cathedral at 11 o'clocl.