What does the word entrenchment mean?

Usage examples for entrenchment

  1. I made out an entrenchment in front, with a wooden bridge over a moat, and then a stone wall with some massive gates. – Hurricane Hurry by W.H.G. Kingston
  2. We walked from the entrenchment, which was rapidly disappearing under the rains and heat of the climate, by the route taken by our people to the promised boats, which were set on fire as soon as they reached them. – Life and Work in Benares and Kumaon, 1839-1877 by James Kennedy
  3. With this he planned to sink a shaft that would serve in the future as the cellar for his villa, and in the present as an entrenchment against danger. – The Planetoid of Peril by Paul Ernst