The Collaborative International Dictionary of English v.0.48:

Crusade \Cru*sade"\, v. i. [imp. & p. p. Crusaded; p. pr. &
   vb. n. Crusading.]
   To engage in a crusade; to attack in a zealous or hot-headed
   manner. "Cease crusading against sense." --M. Green.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Crusading \Cru*sad"ing\, a.
   Of or pertaining to a crusade; as, a crusading spirit.
   [1913 Webster]