He served in Captain Conrad Shimer's company in the 6th battalion of Berks Militia. He served from August 10, 1778 to Sept 1780. He was in the battle of Brandywine near Chadds Ford, Pennsylvania during Howe's campaign to take Philadelphia.
This John was the one who migrated to Union Co. Pennsylvania in 1804.
Record of the Brown family who came to Union County, Pennsylvania in the year 1804" compiled by A. W. Brown; William W. Brown. 1896: Union County Historical Society, Lewisburg, Pennsylvania, 36 p. Photocopy at Family HIstory Library.
It may be possible to confirm family relationships with John 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 John: