Thanks to Alfred Young for sending handwritten copy of Orphans Court Records:
RE: ROBERT ELDER and wife MARY (-) THORN:
Cumberland County, PA Orphans Court Records,
Docket (Book) 2, Page 174, 176, 177
Year 1773, February

"Upon the petition of JOSEPH THORN eldest son of JOHN THORN late of Hamilton township Yeoman
Deceased to the Court setting forth that his Father Died Intestate
owner of two small Tracts of Land Situate in Hamilton Township in this county adjoining
Lands of George Mathews John Hindman John Bussard and the North Mountain
including a small improvement; and containing in the whole two hundred and Forty Acres or Thereabouts:
That he left MARY his Widow (now the Wife of a certain ROBERT ELDER) and lawfull Issue
Five Children namely Joseph (the Petitioner) James, Martha, Ester, & Ann:
That the said Lands cannot be Divided amongst all the children of the Deceased
without predudice to or spoiling the whole and Praying the Court to appoint an Inquest
to view and value the same Lands.

The Court do order that the high Sheriff of the county of Cumberland aforesaid Summon an inquest and go to the Lands and Tenements in Said Petition mentioned and appraise the same and make report of their proceedings to next Orphans Court. -- By the Court--

Whereas by an Order of Orphans Court held at Carlisle for the County of Cumberland the Seventeenth Day of February last the Sheriff of the County aforesaid was Ordered to Summon an Inquest and go to the lands and Tenements of a Certain John Thorn Dec'd in Said Order mentioned and if they should find that the same could not be Divided to and among all the Children of the said Deceased without Injury to and affecting the whole that then they should apprise the same and make report of their proceedings to Next Orphans Court.

Whereupon Ephraim Blaine high Sheriff of the County aforesaid did according to the said order Summon an Inquest of twelve Lawfull men of his Bailiwick (viz) Joseph Armstrong, Robert M'Connel, Samuel Patton, James M'Connel, Alexander Mathews, George Mathews, Joseph Eatton, John Eatton, John M'Connel, James Hindman and James Kelly, who upon their respective Gather did say that they went in their proper persons to the Improvement and Lands therein mentioned in said order late the property of said John Thorn and then and there did Find that the same could not be Divided to and among the said parties in said order Mentioned without prededuce to and spoiling the whole.  Therefore the Inquest upon their oaths did value and appraise the same tract of Land and appurtenances at the sum of three hundred and fifty pounds Lawfull Money of Pennsylvania Subject to the Propriators purchase money and Quit Rents now due and to become due for the same.

Whereupon Joseph Thorn the oldest son of the said John Thorn Deceased came into Court and prayeth the Court that he may hold and possess the said Improvements and Tract of Land and Premisis in as full and ample a manner as his late father John Thorn Dec'd held and Possessed the same he paying the other Children and Legal Representatives of the said Deceased their respective shares agreeable to the said Valuation.

Whereupon it is further Considered by the Court that the said Joseph Thorn Eldest son of said Deceased do ... in his hands the sum of Seventy six pounds Thirteen Shillings and ten pence being his share of the same as eldest son of the said Deceased also pay Mary the Widow of the said Dec'd now the Wife of Robert Elder the sum of six pounds Eighteen Shillings yearly during her natural Life, to James Thorn son of John Dec'd the sum of Thirty eight pounds six Shillings and eleven pence, to Martha the sum of Thirty eight pounds six Shillings and eleven pence.  To Ester the sum of Thirty eight pounds six Shillings and elven pence.  To Ann the sum of Thirty eight pounds six Shillings and eleven pence:  It is also Considered by the Court that the said Joseph
Thorn eldest son of said Deceased pay the respective shares above mentioned to each of the Children and Widows dower at or upon the 18th Day of May in the year of our Lord one Thousand seven hundred and Seventy four and Lawfull Interest from Thence until paid and that upon
Payment or giving Security for Said Shares and Dower as aforesaid that the said Joseph Thorn hold and Possess the said Improvement and Tract of Land and Premesis in a full and as ample a Mannor as the said John Thorn Deceased Possessed the same in his Life-time.--By the Court.
****
Alfred Young notes:
"Mary Thorn was captured by  Indians during the French & Indian War at a small frontier fort
 named Fort McCord on 1 Apr 1756.  She escaped with her infant  daughter [Martha] and three other small
children the next day during a running battle at Sideling Hill/Mtn. between her captors and
 several pursuing parties of settlers and soon thereafter appeared with them at Fort Lyttleton."

JOHN THORN on WorldConnect (married Mary LOWRY):
by Peggy Durand:
http://worldconnect.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=suzaner&id=I25771

Fort McCord photos:
http://freepages.genealogy.rootsweb.com/~nancyelder/pa/FtMcCord.htm

McCORD Family Association:
http://www.mccordfamilyassn.com/pennsylv.htm
...
"In addition, John and Jane McCord Lowry had a daughter Sarah who was captured at the Ft. McCord massacre in 1756. She was later recovered."
...
"The McCord links to the Pollocks is this. John and Elizabeth Lowry were in the same congregation in Derry Pennsylvania in 1733 with William McCord and his family, in the Spring Creek Presbyterian Church there. The church is still in Derry (now Hershey) Pennsylvania."

"James McCord had married Jane, a daughter of John Lowry, and James Pollock married another daughter of John Lowry, name unknown. "

Another McCord Family webpage with photos of the Fort monument, house, etc:
http://www.mccordfamilyassn.com/introduc.htm

Photos:
Ft. McCord Road on Route 4008 near Chambersburg, Pennsylvania, site of Ft. McCord which was attacked April 1, 1756 by Indians. several men killed, and captives taken including Mary McCord

Ft. McCord homesite of William McCord near Chambersburg. Above home is that of Bossert family who purchased farm from McCords in 1790's. Site of Ft. McCord is a few feet away

Marker at Ft. McCord where 27 men, women and children killed or captured April 1, 1756. Their names are on this monument marker plate