Armies don’t need complex phrases like “Last week did I see you go to the library?” And as such they’ve often used non-verbal communications in battle (especially because battle is fucking confusing) this has included drum signals, colored smoke, flags for different actions, and gestures.

When they are using verbal commands they’re often a greatly simplified set of phrases - sometimes in a jargon that isn’t even proper speech. It’s rare to see ten syllable commands and you’re much more likely to hear “company, right” than “Company of soldiers whom I command, please initiate a pinwheel rotation to the right around the rightmost file of your formation. Thank you kindly.” So if Europe had to form an army inter lingually than “a derech” and “a isker” would probably end up being right and left respectively… that or they’d follow the EU trend of “When in doubt, default to French”