Other prehistoric sites of somewhat uncertain date are ''Samrong Sen'' (not far from the ancient capital of Oudong), where the first investigations began in 1875, and ''Phum Snay'', in the northern province of Banteay Meanchey. An excavation at Phum Snay revealed 21 graves with iron weapons and cranial trauma which could point to conflicts in the past, possible with larger cities in Angkor.