He was impeached on one of three counts by the Upper House of the Maryland Assembly for killing several Susquehannock emissarys under a flag of truce months before Bacon's Rebellion in Virginia.
His father was also named Thomas Truman and the family included two additional brothers who also emigrated to the Maryland colony, as well as two daughters who remained in England.
[1] Calvert County voters first elected Trueman as one of their representatives to the Lower House of the Maryland Assembly in 1661, and re-elected him the following year.
[1] Maryland's proprietor commissioned Trueman to command militiamen as well as negotiate a peace settlement with the Susquehannock tribe displaced from the upper Susquehanna River watershed by the Iroquois in 1673.
John Washington and Isaac Allerton surrounded the Susquehannock fort in Maryland for seven weeks before five chiefs came out under a flag of truce.
Truman's troops killed them despite the truce flag, which months later led to impeachment charges against Trueman in the Maryland Assembly.
The remaining Susquehannock managed to leave under cover of darkness not long after, but continuing raids contributed to Bacon's Rebellion the following summer.
Perhaps as indicator of his loss of social standing, in 1677 a land dispute he and his brother Nathaniel had with Thomas Sprigg, factor for Timothy Keyser, reached the Maryland courts.
[6] However, Trueman was released from his bond for good behavior in 1678 and again appointed to the Governor's Council in 1683, so he served the remainder of the session which ended in 1684.
The other heirs were James Truman's daughters Mary who had married Thomas Hollyday (who represented Prince George's County in Maryland's Lower House in 1696), and Ann who married John Bigger (who represented Calvert County in Maryland's Lower House in 1699-1702).