An impressive city wall protected Middle Bronze Age Jerusalem starting in about 1800 B.C.E. The drawing shows what the wall and a heavily fortified gate-tower might have looked like (the tinted area in the drawing represents parts of the wall uncovered in excavations). This section of wall was discovered by British archaeologist Kathleen Kenyon along the eastern slope of the City of David. Some scholars believe that when the exiles returned from Babylonia in the late sixth century B.C.E., they built a wall further up the eastern slope; author Ussishkin argues, however, that they more likely would have restored the remains of the eighth century B.C.E. wall lower on the slope built by King Hezekiah.