Most likely this was an earthen wall, with wooden gates.

No windows opened onto the street, only narrow wooden gates.

We stopped outside a pair of large, slatted wooden gates.

The far end was a pair of double wooden gates to a factory.

Right now, it's just rocky pavilion with huge, wooden gates you can't open.

In later years these were replaced by wooden slatted gates.

The heavy wooden gates on the fortress' south side were wide open.

In the distance, the fort's rough wooden gates were shut.

The heavy wooden gates in the outer wall stood open.

It would not be difficult to breach the walls or batter down the wooden gates.