We know very little about Archibald Guthery. The ties that bind him to John & Archibald Guthery, the two men who are presumably his sons, are admittedly stretched very thin. The 'Archibald' name is found in both lineages, but more importantly the descendants of both lines carry the same Y-DNA. Genetic testing shows that they are both matches for the MD/PA Group.

The source of much of our Guthrie data can be found in Laurence R. Guthrie's 'American Guthrie and Allied Families'. The author provides the only tidbit of information about Archibald Guthery with the following:

"A list of the Detachment of the Pennsylvania Regiment in Garrison at Fort Bedford under command of Col. Joseph Shippen, Jan. 24, 1760; Captain Armstrong's Company: Archibald Gutrie, private." (Pa. Arch., Ser. 5, vol. 1, p. 305.) Strange to say he is the only private named, presumably because he was a recruit. Others "drafted at Loudoun" (Fort Loudon) are mentioned. This Archibald could not be identical with the Archibald, who follows, since the latter was born in 1753, and was not old enough to serve in the French and Indian War."

Fort Loudoun (or Fort Loudon, after the modern spelling of the town) was a fort in colonial Pennsylvania, one of several forts in colonial America named after John Campbell, 4th Earl of Loudoun. The fort was built in 1756 during the French and Indian War by Pennsylvania militia, and served as a post on the Forbes Road during the Forbes expedition that successfully drove the French away from Fort Duquesne.

In 1765, following Pontiac's Rebellion, settlers upset with the resumption of trade with Native Americans forced the British garrison to evacuate the fort, part of an uprising known as the Black Boys Rebellion. A replica of the fort was built on the original site in 1993. {Wikipedia}

1700-1725: ESTIMATED BIRTH RANGE of ARCHIBALD GUTHERY

1744: BIRTH of SON, JOHN GUTHERY
Presumed son, John Guthery was born on 14 April 1744 in Pennsylvania. He married Lydia Baldwin and they settled along the Monangahela near the mouth of Big Whitley Creek. Initially part of Virginia, Springhill, Bedford County area was in dispute between VA & PA. Eventually fell into area of Washington, PA, which later divided and became Greene County, PA. Lydia & John were the parents to 8 sons and 4 daughters. Ancestors of DNA Project participant Lon Kenneth David Guthrie.

1753: BIRTH of SON, ARCHIBALD GUTHERY
Presumed son, Archibald Guthery was born in February of 1753, just before the start of the French & Indian War. He married Rebecca Phillips. He took up land in Whiteley Township, Greene County, Pa. He was a soldier in the Revolutionary War and was wounded by an Indian at what is now East Liberty, Pittsburgh, Pa., early in August, 1779. He managed to escape from the Indian and made his way back to Fort Pitt, a part of which is still standing at the Point, Pittsburgh, Pa., where he died from the effect of his wound, Aug. 5, 1779. Archibald & Rebecca had three children, including one son also named Archibald who is the direct ancestor of DNA Project participant Jerry Hagan Guthrie.

Note that there are 9 years between the birth dates of presumed brothers John & Archibald, suggesting that there might be other unidentified descendants of this line. 

1755: CAPT JOSEPH ARMSTRONG'S COMPANY
On 7 August 1755, privates listed in Capt Joseph Armstrong's company of Cumberland solders included a man named James Guthrie. Is this the same company which Archibald Guthrie joined in 1760? {Source} 

1754-1763: The French and Indian War

The detachment where Archibald Gutrie served as a private was Fort Bedford.
Old Fort Bedford was a British Stockade built in 1758 as part of the French and Indian War campaign against the French at Fort Duquesne. After several failed attempts in the early 1750's, the British launched a major offensive against Fort Duquesne in 1758. Facing the formidable task of crossing the Allegheny Mountains and the threat of attack, numerous stockades were built along the way west. Fort Bedford was constructed as a key fortification along the military path Forbes Road and served as the staging area for the successful campaign. After the war Fort Bedford stood until the 1770's, used as a British outpost on the frontier and as a refuge from Indian attack as westward migration increased in the 18th century. {SOURCE}