Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pĕdĭtātus, ūs, m. [pedes], foot-soldiers, foot, infantry (opp. equitatus, cavalry): aliquem peditatu, equitatu, copiis instruere, Cic. Phil. 5, 2, 6: equitatum peditatumque cogere, Caes. B. G. 5, 3.
In plur.: peditatibus et equitatibus celeriter iter faciens, Auct. B. Hisp. 37.