Fort Parker was a fortified settlement built by members of the extended Parker family and other Pilgrim Predestinarian Baptist Church settlers who had come to Texas from Illinois in 1833. Located about two miles north of present-day Groesbeck, Limestone County, the fort was completed in March 1834, enclosing four acres with 12-foot log walls, two blockhouses, and six attached cabins. Most residents were part of the extended family of John and Sarah Parker.
On May 19, 1836, a large party of Comanche, Kiowa, Caddo, and Wichita raiders attacked the fort. According to Rachel Plummer's later memoir, one raider approached under a white flag that settlers distrusted. Benjamin Parker went out to parley, believing this would buy time for women and children to escape through the fort's rear gate, while his brother Silas Parker argued for manning the walls. Benjamin was killed by lances after a second attempt to talk with the raiders, and Silas was killed outside the gate before he could return inside. Samuel Frost and his son Robert were killed while attempting to flee through the gate. John Parker, an elder of the settlement, was castrated and scalped; his wife was captured after emerging from the woods upon witnessing his death.
During the attack, five men were killed and five people were taken captive: Elizabeth Duty Kellogg, Cynthia Ann Parker, John Richard Parker, Rachel Plummer, and her infant son James Pratt Plummer. Twenty-one other settlers escaped and reached Fort Houston, near present-day Palestine, Texas. Lucy Parker and her two youngest children were briefly captured but were rescued by David Faulkenberry, who ran to the fort from nearby fields.
The captives experienced differing fates. Elizabeth Kellogg was purchased by Delaware traders and ransomed within about three months, reuniting with family by September 1836. Rachel Plummer was held for roughly two years; during captivity she gave birth to a child who was killed by her captor, and she was ransomed by her father in 1838, dying in childbirth in 1840. James Pratt Plummer was ransomed in late 1842 and reunited with his grandfather in 1843. John Richard Parker was ransomed in 1842 but later returned voluntarily to live among the Comanche for several more years before eventually settling in Mexico, where he died in 1915.
Cynthia Ann Parker, then approximately nine years old, remained with the Comanche for nearly 25 years. She married Comanche leader Peta Nocona and had three children, including Quanah Parker, who later became a prominent Comanche war leader during the Red River War of 1874–75. In 1860, Cynthia Ann was recovered by Texas Rangers during the Battle of Pease River and returned to her uncle Isaac Parker's home. She never readjusted to Anglo society and died in 1870.