After the Babylonian Exile, many Jews returned to Jerusalem. They came in relatively small numbers, not sufficient to occupy both the Eastern and Western Hills.
In this annotated drawing we see the rebuilt city of Jerusalem on the Eastern Hill with a smaller Temple on Mount Moriah. The reconstructed Temple Mount had gates and towers and chambers along the inside of its boundaries. The Ophel was to the south of the Temple. The city walls have been reconstructed following archaeological remains that have been found, complemented by the description of the walls in Nehemiah Chapter 3.
A copy without annotations is also available.