The defensive ditch was filled in and barracks built to the south.

Evidence suggests that a defensive ditch would have surrounded the site, with timber walls.

The defensive ditch surrounding the entire area was more than a mile long.

When filled with water, such a defensive ditch is called a moat.

The defensive ditch that the Romans had constructed was filled in.

Originally there was a defensive ditch along the outside of the walls.

Finally he constructed a defensive ditch and walls around the city.

Access to the castle is by means of a brick bridge over the defensive ditch.

A defensive ditch, 20 to 25 feet deep, ran along the land side of the fort.

It was surrounded with a city wall with 3 gates and a defensive ditch.