According to family tradition, Zackquill and his brother David served with Virginia forces in Braddock's ill-fated expedition (1755) and in the more successful expedition by General Forbes in 1758. In 1761 Zackquill received from his father one thousand acres (4 km²) of land in Berkeley County which had been patented in November 1735. Most historians believe that David Morgan and his younger brother Zackquill Morgan were the next Europeans to attempt a permanent settlement in Monongalia County. About 1765 or '66, he migrated, with David, to Georges Creek, Pennsylvania. They left Delaware and reached present-day Morgantown in 1766 or '67. A family tradition attributes the settlement of Zackquill Morgan, in 1768, but at that time he appears to have been still living in what was later Fayette County. According to a deed on file at Uniontown, Pennsylvania, Zackquill was living at Great Meadows, Bedford [now Fayette] County, Pennsylvania, on August 28, 1771, when he sold his farm there.