The sources are particularly rich in accounts of the Sasanian art of warfare because there existed a substantial military literature, traces of which are found in the ????h-n??ma, D??nkard 8.26???an abstract of a chapter of the Sasanian Avesta entitled Art????t??rest??n ???warrior code??????and in the extracts from the ??????n-n??ma which Ebn Qotayba has preserved in his ??Oy??n al-a???b??r and In