9. Towers in Jerusalem. Walls in Oriental cities still have great towers at the city gates. These are for the housing of troops and the storage of arms in times of emergency. The gate here mentioned was probably at the northwest corner of the city (see 25:23).
The valley gate. This was probably the gate at the southwest corner (see Neh. 2:13; 3:13). See The Walls of Jerusalem in Nehemiah’s Day.
Turning of the wall. Compare Neh. 3:19, 20, 25. Some think this tower was on the eastern side of Zion, at a bend in the wall, and thus served to defend both Zion and Mt. Moriah against attacks from the southeast.