http://www.genealogy.com/ftm/k/r/a/John-C-Kraybill/GENE2-0007.htm
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"JACOB GERBER, eldest son of Christian Gerber the immigrant, was married by 1753, for in that year he and his wife, Mary, built a stone house on their farm in Hempfield Township. The house was subsequently enlarged by their son Andrew and grandson Jonas, and is still occupied as a family dwelling. In 1770, Jacob purchased the land in Donegal Township that had formerly belonged to his younger brother, Michael, and took up residence there in 1788. Jacob drew up his will in German on March 6, 1800 and it was probated January 20, 1801. It is not known where he is buried. ... With the coming of the Revolutionary War, the non-resistant commitments of our Gerber ancestors were put to the test. In 1775, the Lancaster County Committee of Observation resolved that inhabitants should associate into companies for the purpose of becoming acquainted with 'military discipline and the art of war'. Like many members of the peace churches, JACOB GERBER and his brother Christian refused to join. Their names are absent from the list of Associators in Hempfield Township for 1775. The refusal of the pacifists to serve in the military did not go unnoticed. Non-Associators were branded as 'enemies of American liberty'. In an attempt to increase the ranks of the militias, the Pennsylvania Assembly imposed a fine of 3 pounds 10 shillings on Non-Associators. This had little impact on the conscientious objectors. The Hempfield Township tax assessment list of August 1777 shows that many, including Jacob and Christian Gerber, paid fines as Non-Associators. A more significant development occurred in March 1777 when the Assembly passed the Militia Act requiring all white males between 18 and 53 to enroll, regardless of religious beliefs. The Lancaster County militia roll for 1782 includes the names of Christian Gerber, his son Andrew, and Jacob Gerber's son Andrew. Jacob Gerber is not listed because he was over 53. Does the fact that the Gerbers enrolled mean that they actually served? Probably not. First, the roll must be understood for what it was: 'a true and exact list of the names of every white male residing within' a certain district. In effect, it was a census. Second, there is evidence that only a minority of the Mennonites appearing on the rolls actually performed military duty. A majority refused and incurred heavy fines as a result."(Taken from The Descendants of Christian S. & Anna Garber of Lancaster County, by Allan A. Garber, 1985, pp.9-13.)