Site of First Front Gate

Destroyed in World War II, this gate formed a square shape with the Second Front Gate, had a smaller gate on the side with a gabled and tiled roof. The wall section under the front part of the gate was covered with wooden tiles, and the gate itself was iron plated and rocks could be dropped from a second story machicolation. The door on the smaller gate was latticed for reinforcement.

From the context I guessed what a machicolation was but I had to look it up anyway.