Dates May not be Sequential
In February, 1645, they ordered the construction of forts at three locations they considered strategic in the colony’s defense against the Indians: Fort Charles at the falls of the James River; Fort James on the Chickahominy; and Fort Royall “at Pomunkey.” …
In March, 1676, when the Grand Assembly again resolved to construct forts for the garrisoning of men “on the heads of rivers” as a defense against the Indians, they decided to build one ‘at or neare Mahixon upon Pomunkie River,” …
Although Opechancanough was captured and killed in 1646, it should be recalled that he was alive in 1645 when Fort Royall was built (Beverley 1947:49—50).
Martha MacCartney’s “Daft of York”
The assumption that the construction all the forts were immediate built after the passage of the Virginia Grand Assemblies resolve is not probable. If the easy forts were built first and then the Pamunkey fort was built last because it was in dangerous enemy territory, then this aligns with the fact its location changed its location from the Mahixon (7 miles upstream) to Manskin lodge location. So if they destroyed the village of Opechancanough family’s at Manskin Lodge and built a fort on top of it site. Then this would be a great staging area on the fortress of warriors at “The Island” just down stream. This was the same warfare tactic the Americans used against the Japanese in WWII:  Destroy an enemy village, build a base on top of it and then attack the next island.