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He did not have enough men to invest the city with continuous trenchlines, so he set up a series of outworks, ("bastides").
en.wikipedia.org These plans called for the fortress to be a trapeziform stronghold surrounded by a wet ditch and by outworks on the land side.
en.wikipedia.org Nobody was going to outwork him in preparing for a trial.
en.wikipedia.org The gateway was originally approached by a drawbridge over a dry moat, but these were removed with all the other outworks in the 1880s.
en.wikipedia.org Several different plans were advanced for a demi-lune outwork in front of the entrance but in the end none was built.
en.wikipedia.org