Slitherine

What phrases can legions say when you command them to march about? I played this game many years ago as a kid but sadly do not have lost my copy.
I remember them saying phrases like "io imperator" and "velites procidei". I suppose this would be easier to remember if I knew Latin.
Does anyone know what they were actually saying?

Yes. Velites, procedit! means, Velites, march! Hio Imperator is simply saying Hail Emperor.