David was born 16 Mar 1835. He was the son of James McIntosh and Martha Gregg.  He studied law in the office of John A. Inglis of Cheraw, and about 1860 began the practice of law in partnership with W. W. Harllee at Darlington Court House. This ended in 1861 by the beginning of the War Between the States.
He had a distinguished career in the Confederate service from the very beginning of the war until the surrender at Appomattox Courthouse. He rose to the rank of colonel  and was the last survivor of Gen. Lee's full Colonels of artillery in the Army of Northern Virginia. After the war, he had an equally distinguished career in the profession of law in Towson MD and at one time was president of the Maryland State Bar Association.
He married 08 Nov 1865 in Richmond, Virginia to Virginia Johnson Pegram, daughter of James W. Pegram and Virginia Johnson.  Virginia was born 15 Jul 1843 and died 18 Apr 1920 in Baltimore, Maryland.  She is buried at Hollywood Cemetery, Richmond. Beside her never-failing devotion to and care of her husband and children, she took an active part in the work of Trinity Episcopal Church in Towson, Maryland and was also an active member of The Maryland Division United Daughters of The Confederacy. 
David McIntosh died 16 Oct 1916  and is buried in Hollywood Cemetery, Richmond, Virginia. 
Confederate War Report
No. 333. Report of Captain D. G. McIntosh, Pee Dee (S. C.) Artillery, of the battles of Mechanicsville and Gaines' Mill.
HEADQUARTERS PEE DEE ARTILLERY
July 14, 1862.
GENERAL: In obedience to orders I submit herewith a report of the part taken by my command in the late combats before Richmond:
At about 4 p.m. on the afternoon of Thursday General Hill ordered me to engage the enemy's batteries to the rear of Mechanicsville, then shelling the head of our column. I took position behind a small breastwork of the enemy and opened upon them at a distance of about 700 yards, mine being, I believe, the first battery to open fire. After a few rounds one of the howitzers broke its axle and had to be sent to the rear. The fire from the other three pieces was continued with slight intermissions until about 9 o'clock, when I was ordered by General Hill to cease. The enemy at one time directed a fire against me from three points, but the only casualties which occurred was the killing of 4 horses. I had discharged when the firing ceased 160 rounds from each gun, and they became so warm during the action that it was with great difficulty the brass piece could be worked.
At daylight on Friday morning the firing was resumed on my side slowly, as I had but little ammunition left. At 8 o'clock, having expended every round, I withdrew.
The casualties on this morning were-1 man, Private J. T. McLindon, killed and Private Newgas severely wounded. One horse was also killed. I carried into this action 70 men, exclusive of officers.
At 12 m., having received a supply of ammunition, I followed the division and overtook it at Cold Harbor.
During the afternoon you ordered a section of the battery into action and finding no artillery opposed to me, and the smoke too great to tell friend from foe and reporting the same to you, I was ordered to retire.
In this action Sergeant Hepburn was wounded in the arm.
On the battle-days of Monday and Tuesday I was frequently with the battery under fire, but took no part in either action.
↑ "United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8QF-SM3 : 12 April 2016), David Mc Intosh in household of Jas H Mc Intosh, Darlington county, Darlington, South Carolina, United States; citing family 317, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
↑ "United States Census of Union Veterans and Widows of the Civil War, 1890," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K8SN-R7Z : 14 November 2014), David G Mcintosh, 1890; citing NARA microfilm publication M123 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 338,167.
↑ "Virginia Marriages, 1785-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XRJK-4HG : 11 February 2018), David G. Mc Intosh and Virginia J. Pegram, 08 Nov 1865; citing Richmond, Virginia, Usa, reference p 84; FHL microfilm 33,620.
↑ "United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNST-4QG : 12 April 2016), David G Mcintosh, Maryland, United States; citing p. 11, family 71, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,069.
↑ "United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNQM-3TR : 15 August 2017), David G Mcintosh, Towsontown, Baltimore, Maryland, United States; citing enumeration district ED 246, sheet 304B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0496; FHL microfilm 1,254,496.
↑ "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3KS-G8S : accessed 10 March 2018), David G Mcintosh, Election District 9, Towson, Precinct 4, Baltimore, Maryland, United States; citing enumeration district (ED) 43, sheet 4B, family 79, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,607.
↑ "Virginia, Historical Society Papers, 1607-2007," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KZ7G-CT5 : 7 July 2017), David Gregg Mcintosh, 06 Oct 1916; Death, citing Virginia, United States, Virginia Historical Society, Richmond.
↑ The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, Series 1, Volume XI, Part 2, Peninsular Campaign, Virginia, Chapter XXIII, page 860.
Reminiscences of Early Life in South Carolina, by David Gregg McIntosh and Horace Fraser Rudisill, Saint David's Society, Florence, S.C., 1985
McIntosh, David Gregg, The Campaign of Chancellorsville, W. E. Jones Sons, Inc., Richmond, 1915
Genealogy and Biography of Leading Families of the city of Baltimore and Baltimore County, Maryland. New York, Chicago, Chapman Publishing Company, 1897, pp. 567-569
"United States Civil War Soldiers Index, 1861-1865," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FSN3-SM4 : 4 December 2014), David G. McIntosh, Captain, Company , Zimmerman's Company, South Carolina Artillery (Pee Dee Artillery), Confederate; citing NARA microfilm publication M381 (Washington D.C.: National Archives and Records Administration, n.d.), roll 21; FHL microfilm 881,987.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2XG-D1F : accessed 13 November 2016), David G Mcintosh, Election District 9, Baltimore, Maryland, United States; citing enumeration district (ED) ED 33, sheet 6B, family 131, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 551; FHL microfilm 1,374,564.
Descendants of James McIntosh who was born about 1734, compiled by J. Rieman McIntosh, Baltimore, Maryland, 1978 (unpublished, donated to DAR Library)
It may be possible to confirm family relationships with David by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with David: