Page 334 - The Duffield Family – George Duffield (II), progenitor of those of the name in Michigan, was twice married. His first wife, whose maiden name was Elizabeth Blair, died in 1757, without issue. In 1759, he married Margaret Armstrong, a daughter of James Armstrong, a noted Indian fighter on the frontier, and a sister of General John Armstrong held the rank of major general in the Continental army and in 1778-79 was a member of the provincial congress from Pennsylvania.
