What does the word outwork mean?

Usage examples for outwork

  1. Rebecca could observe, from the number of men placed for the defence of this post, that the besieged entertained apprehensions for its safety; and from the mustering of the assailants in a direction nearly opposite to the outwork, it seemed no less plain that it had been selected as a vulnerable point of attack. – Journeys Through Bookland Volume Four by Charles H. Sylvester
  2. We lost the outwork on our part. – Journeys Through Bookland Volume Four by Charles H. Sylvester
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