Escalading

from The Collaborative International Dictionary of English v.0.48

Escalade \Es`ca*lade"\, v. t. [imp. & p. p. {Escaladed}; p. pr.
   & vb. n. {Escalading}.] (Mil.)
   To mount and pass or enter by means of ladders; to scale; as,
   to escalate a wall.
   [1913 Webster]