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Looking east at the revetment wall from the MB II period. This wall is located on the southern end of the tell and was excavated by an Italian team in the 1990's.
Reconstructions of the walls of Jericho suggest that there were two walls: an outer mud brick wall - which was built on top of this revetment wall - and an "inner wall" - located higher up (off the picture to the upper left) on the mound. Bryant Wood has suggested that this revetment wall, and associated mud brick walls, were not destroyed in 1550 B.C. (the "traditional" ending of the MB II archaeological period), but rather continued in use into the Late Bronze Age - being destroyed in the conquest of Joshua, about 1400 B.C.
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Image from the Zondervan Atlas of the Bible, p. 110.