The Wall of Jericho is a Pre-Pottery Neolithic A (PPNA) defensive or flood protection wall suggested to date to approximately 8000 BC. In the Book of Joshua, the Israelites destroy the wall of Jericho by walking around it with the Ark of the Covenant for seven days, on the last of which they blew trumpets of rams' horns and shouted to make the walls fall down (Joshua 6:20). The events of the account are suggested to be dated at around 1400 BC. Speculations about the existence of fortifications dating to this period persisted in biblical archaeology until Kathleen Kenyon's comprehensive excavations in the 1950s. One wall was excavated by Sir Charles Warren in 1868 at the request of the Palestine Exploration Fund. He dug through the mud bricks of the wall without realizing what it was, suggesting there was little of interest at the site. Ernest Sellin and Carl Watzinger excavated Jericho between 1907 and 1909 and found the remains of two walls which they initially suggested supported the biblical account. They later revised this conclusion and dated their finds to the middle Bronze Age (1950-1550 BC). The site was again excavated by John Garstang between 1930 and 1936, who again raised the suggestion that remains of the upper wall was that described in the Bible. Kathleen Kenyon resumed extensive excavations between 1952 and 1958 and found no late Bronze Age defensive wall or pottery. Her excavations found a series of seventeen early Bronze Age walls, some of which she thought may have been destroyed by earthquakes. The last of the walls was put together in a hurry, indicating that the settlement had been destroyed by nomadic invaders. Another wall was built by a more sophisticated culture in the middle Bronze Age with a steep plastered escarpment leading up to mud bricks on top. After this there was a hiatus until later iron age material dating to around the seventh century BC. They did not find substantial evidence for renewed occupation in the late Bronze Age at the time of Joshua, which in general agreed with the earlier statement by Watzinger that "in the time of Joshua, Jericho was a heap of ruins, on which stood perhaps a few isolated huts". Perhaps the most important discovery was evidence that the earliest wall suggested by Kenyon to date to around 8000 BC based on Radiocarbon dating of material at 7825 BC from level IV, phase III of the site. This time period was thereafter called the Pre-Pottery Neolithic A stone age and the wall considered part of an early proto-city. It surrounded and protected a Neolithic settlement which contained an organized community of between 2000 to 3000 people. The wall was complemented by a stone tower built into it. The wall is thought to have been built in order to prevent floods and the tower used for ceremonial purposes[6] but the height of the wall (approximately 5 feet (1.5 m) thick and 12 to 17 feet (4--5 m) high) as well as that of the tower suggests a defensive purpose as well. Furthermore, the construction of such a project implies some sort of social organization, division of labour, and classes. Surrounding the wall was a ditch 27 feet (8 m) wide by 9 feet (3 m) deep, cut through solid bedrock with a circumference of around the town of as much as 600 metres (2,000 ft). Kathleen Kenyon commented on the work involved in the construction of the ditch: "The labor involved in excavating this ditch out of solid rock must have been tremendous. As we have discovered nothing in the way of heavy flint picks, one can only suppose that it was carried out with stone mauls, perhaps helped by splitting with fire and water."The wall itself was 6.5 feet (2 m) wide by 12 feet (4 m) high. The town of Jericho, which was about six acres (2.5 ha) in size, preceded the wall by about 500 years. In fact, evidence suggests that construction started prior to the agricultural revolution. The town contained round mud-brick houses, yet no street planning. Despite the existence of the wall and tower, Jericho is still a proto-city, much like Çatalhöyük. Speculation persists about the purpose of the tower and it may have had several purposes. Archaeologists Ran Barkai and Roy Liran used computers to reconstruct sunsets and recently found that when the Tower of Jericho was built, nearby mountains cast a shadow on it as the sun set on the longest day of the year. The shadow fell exactly on the structure and then spread out to cover the entire village of Jericho. In an article in the Jerusalem Post, archaeologist Ran Barkai argued that the structure was used to create awe and inspiration to convince people into a harder way of life with the development of agriculture and social hierarchies. He concluded with, "We believe this tower was one of the mechanisms to motivate people to take part in a communal lifestyle".

• published: 20 Jun 2013
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