Daniel McFarland's Historical Dictionary of Upper Volta refers to them as "intrusive Mande who settled the area along the White Volta below Tenkodogo by 1300.
The passage states that Daniel McFarland's Historical Dictionary of Upper Volta identifies a specific time period (around 1300 CE) and location (the area along the White Volta River below Tenkodogo) for the settlement of Mande people in Upper Volta.