At three excavation holes on a total area of 600sq.m, scientists havefound various layers of citadel walls built by clay compressed withtiles, clay blocks compressed by wooden hammers and by human feet, andbig natural block of clay.
Tong Trung Tin, Rector ofVietnam Archaeology Institute said the crucial skill resulting in thesteadiness of the citadel lies on a 50cm-thick layer of clay compressedby nails.
Ceramic tile pieces dating back to the Tran dynasty(1225-1400) and an earlier period were found compressed tightly withclay on a layer 0.2m thick and 1.2m wide.
There was also a Vchannel running between the tile clay compressed wall and the outercitadel wall, which was guessed to be an exit way around the citadelunder the Tran reign.
Two layers of clay compressedwith gravel have also been unveiled at a depth of 4.5m, which has alsocontributed to the solidity of the wall.
Variouslayers of clay dating back to the 8-9th century, the Ly dynasty(1009-1225) and the Tran dynasty making up the 7m-high wall proved thetheory that the Dai La Citadel was carefully renovated under Ly-Tranreigns, scientists said.
They hold that the Dai LaCitadel was used as a dyke to prevent the inner citadel area from beingflooded by the To Lich River.
Between the clay layers,scientists have found four tombs, including two brick-built ones and aclay-built one from the 9-10th century. The rest of the clay-built tombwas found in a layer dated back to the 17-18th century.
Dai La Citadel, built in 767 and underwent many improvements overtime, was the former name of Thang Long Citadel, today’s Hanoi.-VNA
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