Sarah needed a way to prove that she was married to William but she did not have a marriage certificate. William and Sarah had married in 1811, just prior to the outbreak of the war. William joined under Captain Arch Campbell's New York Militia in January 1814 and served for three months.
According to this letter in William's pension file, he and Sarah had friends named James and Polly Jones who had known them for over thirty years. This letter was written in 1854, so calculating the dates it means that James and Polly became acquainted with William and Sarah about 1824. This would be ten years after William's service in the War of 1812.
James Jones and Polly Jones his wife
Being duly sworn severely say that
they have been Personally acquainted with Wm. F. Card and Sarah Card his wife for about thirty years And knew them to live together
as husband and wife and never herd [sic] it questioned or in any way
Disputed But that they had been Lawfully Married. [signed] James Jones, Polly Jones Subscribed and sworn to this 21st day of Oct 1854 before me [signed] J Leonard, Justice
William and Sarah were living in Ossian, Allegany County, New York during the 1820s and 1830s, when James and Polly would have known them. Nine of the Card children were born in Ossian. This friendship with the Jones family is extremely important to the ongoing research into the lives of my 3rd great-grandparents William and Sarah Card.