Charles's body has been exhumed on three occasions to ascertain the cause of death; in 1746, 1859 and 1917. The 1859 exhumation found that the wound was in accordance with a shot from the Norwegian fort. In 1917, his head was photographed. Peter Englund asserted in his essay "On the death of Charles XII and other murders" that the mortal wound sustained by the King, with a smaller exit wound than entry wound, would be consistent with being hit by a bullet with a speed not exceeding 150 m/s, concluding that Charles was killed by stray grapeshot from the nearby fortress.