Richard Burton’s brief comment (Burton 1876, pg 208), from a journey in 1862, was: “The ‘terrible war-axe’ is the usual poor little tomahawk, more like a toy than a tool.” This was at the village of Mayyan (Magyan according to Tessmann 1913) on the Mbokwe (now Mbeya) River. I'm guessing that Mayan/Magyan is the present day Mayangone, which is in approximately the right place.