Eastern Auxiliaries - Linguistic question

[PhilusEstilius]

I also do not think there would have been to much of a linguistic problem at all in the Roman Army for the different nationalities of the auxiliary would well have been commanded up to a point by their own countrymen. The officers in charge may well have been Roman in the earlier periods of the Empire and documentation would have no dought been in Latin, however the every day running would have been on multilingual basis.