From Wikipedia:
The first Amish began migrating to the United States in the 18th century, largely to avoid religious persecution and compulsory military service. The Northkill Creek watershed, in eastern Province of Pennsylvania, was opened for settlement in 1736 and that year Melchior Detweiler and Hans Seiber settled near Northkill.[1] Shortly thereafter many Amish began to move to Northkill with large groups settling in 1742 and 1749.
In 1742, the group was large enough to petition the Pennsylvania General Assembly for naturalization rights, allowing them to purchase land.[2] The group was strengthened in 1749 when bishop Jacob Hertzler[3] settled in Northkill and the settlement grew to nearly 200 families at its height.[4]
Hochstetler massacre
The Northkill settlement was on the edge of the Blue Mountain, the legal boundary of European settlement according to agreements with Native Americans. During the French and Indian War, local tribes under the command of three French scouts attacked the Northkill settlement on September 19, 1757.[5] The Indians attacked the Jacob Hochstetler homestead and set the house afire. The Indians stood guard around the house and torched the Hochstetler home, so the family could not escape without risking their lives. As the fire worsened, the family escaped out the cellar window, but the wounded Jacob Jr. (he had been shot during the initial attack) and Jacob Sr.'s wife (her name is unknown) slowed them down. She became stuck in the window during her escape, and was later stabbed in the back and scalped.[6] Another daughter (name unknown) and Jacob Jr. were killed. Jacob Sr. and Joseph and Christian (ages app. 12-15 years) were taken captive. Jacob escaped after about 8 months, but the boys were held for several years, released after a peace treaty between the natives and the British Army was agreed upon. Altogether over 200 people were murdered in Berks County during various raids.
Decline
Northkill remained the largest Amish settlement into the 1780s and then declined as families moved on to areas of better farmland.[7]
Although it existed for only a brief period, the Northkill settlement was fundamental in establishing the Amish in North America. The Northkill settlers included the progenitors of many widespread Amish families, such as the Yoders, Burkeys, Troyers,[8] Hostetlers,[9] and Hershbergers.[10]
Jacob Hochstetler is the subject of Harvey Hostetler's book The Descendants of Jacob Hochstetler. (unfortunately few copies exist) In addition to listing the hundreds upon hundreds of Americans who share Jacob as a common ancestor, this book provides a detailed history of the Amish religious persecution in Europe, American immigration at the time, the massacre of Hochstetler's family members, and the kidnapping and subsequent escape of Jacob and his sons.