By the 1669 census, because of raids by enemy Iroquois tribes from the north (during the Beaver Wars) and probably infectious disease from European contact, the Manahoac were reduced to only fifty bowmen in their former area. Their surviving people apparently joined their Monacan allies to the south immediately afterward. John Lederer recorded the "Mahock" along the James River in 1670. In 1671 Lederer passed directly through their former territory and made no mention of any inhabitants. Around the same time, the Seneca nation of the Iroquois began to claim the land as their hunting grounds by right of conquest, though they did not occupy it.