What is a furious attack made by troops on a fortified place, in which ladders are used to pass a ditch or mount a rampart. Sin enters, not by escalade, but by cunning or treachery. Buckminster called?

escalade — A furious attack made by troops on a fortified place, in which ladders are used to pass a ditch or mount a rampart. Sin enters, not by escalade, but by cunning or treachery. Buckminster. (Webster's 1913.)