the hills north of Chimri. No relics, however, could be found at the first two sites, although potsherds at Chidu and brick walls, steps, etc. at Cheko Nati were reported to have been seen earlier. The third site north of Chimri is situated at a high altitude of about 610 m. Not a single brick found there was in alignment, and everything seemed destroyed. The situation of all the four sites on a hilly terrain suitable for defence indicate that they are parts of a single complex representing a fort which extended from Chidu to Chimri. It is probable that the main centre of this complex was at Cheko Nati. Another archaeological site called Duku Limbo is on the left bank of the Dibang at'the foot of Elopa hill. The brickbats found at this site suggest that the Brismaknagar culture had extended to this point. Tezu Fort An old Mud Fort in the Tindolong area, six km from Tezu, was explored in 1972. It falls on the main road from Sadiya to Tezu. The area of the fort, enclosed by earthen ramparts—365.76 m X 350.52 m, is square in shape. The rampart is eight ft high, and equally broad at the top with sloping sides. On both the -inner and outer sides of the rampart run two ditches about 6 m wide. There is a prominent mound, circular in shape (diameter 30.48 m approximately) and about 3 m in height, almost at the centre of the enclosure. The mound appears to be a cavalier for lookout purposes. Some potsherds found at this site are too fragmentary to bear any conclusive evidence. It may, however, be assumed that the Mud Fort linked by the route from Bhismaknagar to Parshuram Kund was probably associated with the early culture that flourished in and around Sadiya and Bhismaknagar. The complex seems to represent a defensive mud-fort or redoubt of a modest dimension unlike the fortified city of Bhismakanagara. It was suitable for a small band of soldiers to maintain vigilance against the enemies from their hide-outs inside jungle especially in guerilla warfare, the normal practice in the region. Scarp and counter-scarp provided by the rampart and ditches immensely strengthened the defence in the topography of the country. Strategic considerations are palpable from the situation of the fort on principal route from Sadiya and Bhismaknagar to Parshuram Kund facing the Lohit river, perhaps to keep