He was born in Boston, Massachusetts, in 1826/27. [sources: place: 9, 12, 14, 20. date: 9 (35 in 1862), 12 (33 in 1860), 14 (43 in 1870), 20 (23 in 1850)]
He married Marion B [unknown family name]. She was born in 1823/24, in Massachusetts. They seem to have had at least these children:
[sources: 10, 12, 13, 14, 15, 20]
In 1850, he was living in ward 11, Boston, Suffolk County, Massachusetts. He was living with MB Mansfield (presumably his wife), and two others. He was a painter. [source: 20]
In 1860, he was living in Philadelphia, Pennsylvania. He was a housepainter. He owned $200 in personal property. He was living with Marion (presumably his wife) and with Estella and Ann (presumably their children. [source: 12]
When he enlisted, he was a builder. [source: 9]
When he enlisted, he was 5 feet 7-1/2 inches tall, and had a dark complexion, gray eyes, and dark hair. [source: 9]
He enlisted and was mustered into service on 28 August 1862. He was enlisted for three years, at Philadelphia, Pennsylvania, by Lieutenant Gregory. He was a private, in company F. [sources: 1, 9, 21]
He was promoted on 1 January 1863 to second sergeant. [sources: 1, 7, 9]
On 27 February 1863, he presented Colonel Gregory with a 'costly and beautiful sword' (from the enlisted men). [source: 17]
On 19 March 1863, he was absent on furlough. [source: 4]
On 3 May 1863, he was present at the Battle of Chancellorsville. He saw Benjamin Tayman, apparently looking for Lieutenant Colonel Sinex. [source: 17]
On 27 May 1863, he testified at the trial of Benjamin Tayman. 17]
He fought at the Battle of Gettysburg. [source: 11]
On 30 December 1863, Sinex reported that he was one of 30 men who had more than fifteen months to serve who were willing to reenlist. On 2 January 1864, he was transferred to the 155th Pennsylvania Infantry, while those eligible were on veterans' leave. [sources: 2, 6]
Sinex also detailed him on the 30th for duty in the ambulance train, replacing John Hamill. He was still there in September (?) 1864. [sources: (3, 5 (Col Gregory, not Sinex)]
He was discharged on 1 June 1864 or 1 June 1865 by general order. He was a sergeant, in company F. [sources: 1, 8 (1 Jun 64), 21]
On 7 July 1865, he applied successfully for a pension. [sources: 10, 13]
In 1870, he was living in Richland Township, Bucks County, Pennsylvania. He was living with his wife Marion and daughter Estella. He was a farmer, and owned $3,500 in real estate and $1,000 in personal property. [source: 14]
On 17 April 1875, he died. He was buried in Dwight Cemetery, [Morris County,] Kansas. [sources: 18, 19]
On 12 June 1873 [?], his widow, Marion B Mansfield, applied successfully for a pension. [sources: 10, 13]
In 1880, his widow, Marion B Mansfield, was living in Ohio Township, Morris County, Kansas. She was living with her daughter Estella. [source: 15]
The government supplied a tombstone for his grave, under a contract dated 5 September 1891. [source: 18]
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)
2 letter, Sinex to Marvin, 30 December 1863
3 special order 123, HQ 91st PA, 30 December 1863
4 consolidated morning report, 91st PA, 19 March 1863 (Sergt Mansfield)
5 [list of detailed men, probably from Sept 1864] (David F Mansfield)
6 consolidated morning report, 91st PA, 2 January 1864 (Mansfield)
7 company F, list of non-commissioned officers (David Mansfield)
8 company F, register of men discharged (David F Mansfield)
9 company F, descriptive roll, #108 (David F Mansfield)
10 pension index, by name (David F Mansfield)
11 Pennsylvania Memorial, Gettysburg, Pennsylvania (David F Mansfield)
12 1860 US census, Pennsylvania, Philadelphia, microfilm series M653, film 1151, page 432 = 172 [??] handwritten (David Mansfield)
13 pension index, by regiment, 91st PA Infantry, company F (David F Mansfield)
14 1870 US census, Pennsylvania, Bucks County, Richland Township, microfilm series M593, film 1314, page 573 = 45 handwritten (David Mansfield)
15 1880 US census, Kansas, Morris County, Ohio Township, supervisor's district 2, enumeration district 135, microfilm series T9, film 390, page 413 = 13 D handwritten (Marion B Mansfield)
16 anonymous, 'From the Ninety-first Penna Regiment', Philadelphia Inquirer 9 March 1863, page 2 (D F Mansfield)
17 National Archives and Records Administration, Record Group 153: Records of the Office of the Judge Advocate General (Army), 1792-1982, general court martial, 25 May 1863 (David T Mansfield)
18 Records of headstones of deceased Union veterans, 1879-1903 (David F Mansfield)
19 Find a grave, memorial 41184140, created by Becky Doan 26 August 2009, accessed 18 February 2012 [identity confirmed by reference to his service on the tombstone] (D F Mansfield)
20 1850 US census, Massachusetts, Suffolk County, Boston, ward 11, microfilm series M432, film 338, page 4 recto = 7 handwritten (D F Mansfield)
21 index to compiled service records of volunteer Union soldiers who served in organizations from the state of Pennsylvania (David F Mansfield)
| line | 26 | 27 | 28 | 29 |
| Dwellings visited | [33] | |||
| Families visited | 44 | |||
| Name | D. F Mansfield | M. B. " | Mr Mayler | Mrs " |
| Age | 23 | 26 | 36 | 35 |
| Sex | " [sc. m] | f | m | f |
| Color | ||||
| Occupation of males over 15 years | Painter | Lamp Maker | ||
| Real estate owned | ||||
| Birthplace | " [sc. Mass] | " | Germany | Mass |
| Married within year | ||||
| Attended school within year | ||||
| Over 20 & can't read/write | ||||
| Deaf, dumb, blind, etc. |
| line | 35 | 36 | 37 | 38 |
| Dwelling number | 1234 | |||
| Family number | 1420 | |||
| Name | David [illegible] Mansfield | Marion B " | Estella F " | Ann B " |
| Age | 33 | 36 | 6 | 4/12 |
| Sex | m | f | f | f |
| Color | ||||
| Occupation | house painter | |||
| Value of real estate owned | ||||
| Value of personal estate | 200 | |||
| Place of birth | Mass | " | " | Penna |
| Married within year | ||||
| Attended school within year | ||||
| Cannot read & write | ||||
| Deaf, dumb, blind, etc. |
| line | 11 | 12 | 13 |
| Dwelling-house number | 349 | ||
| Family number | 387 | ||
| Name | Mansfield David | - Marion B | - Estella |
| Age | 43 | 46 | 16 |
| Sex | M | F | F |
| Color | W | W | W |
| Occupation | Farmer | Keeps house | At home |
| Real estate value | 3500 | ||
| Personal estate value | 1000 | ||
| Birthplace | Massach | " | " |
| Father foreign born | |||
| Mother foreign born | |||
| Birth month if born within year | |||
| Marriage month if married within year | |||
| Attended school past year | |||
| Can't read | |||
| Can't write | |||
| Deaf, dumb, blind, etc. | |||
| Male US citizen at least 21 years old | 1 | ||
| Male US citizen at least 21 years old who can't vote ... |
| line | 18 | 19 |
| street name | ||
| house number | ||
| dwelling visit # | 120 | 121 [sic] |
| family visit # | 121 | 122 [sic] |
| name | Mansfield Marion B | Estella F |
| color | W | W |
| sex | F | F |
| age | 56 | 26 |
| month born if born in year | ||
| relationship | Daughter [sic] | |
| single | 1 | |
| married | ||
| widowed/divorced | 1 | |
| married during year | ||
| occupation | Keeping House | |
| months unemployed | ||
| currently ill? | ||
| blind | ||
| deaf/dumb | ||
| idiotic | ||
| insane | ||
| disabled | 1 | |
| school this year | ||
| can't read | ||
| can't write | ||
| birthplace | Mass | Mass |
| father's birthplace | Mass | Mass |
| mother's birthplace | Mass | Mass |