There have been three attack points on the Nephite lands. The first was along the west coast with an incursion at Ammonihah, evidently a reasonable location to pass over the mountains that lay between the west coast and the valley of the Sidon. The next previous invasion was on the east through Antionum. The final area was the oldest entrance point at the head of the Sidon valley. We have seen Moroni strengthening the west and the east entry points, and it is probable that this southern defense refers to the remaining entrance point.