The Collaborative International Dictionary of English v.0.48:

Rally \Ral"ly\ (r[a^]l"l[y^]), v. t. [imp. & p. p. Rallied
   (r[a^]l"l[i^]d); p. pr. & vb. n. Rallying.] [OF. ralier, F.
   rallier, fr. L. pref. re- + ad + ligare to bind. See Ra-,
   and 1st Ally.]
   To collect, and reduce to order, as troops dispersed or
   thrown into confusion; to gather again; to reunite.
   [1913 Webster]