Military cadence song

[Darthoniata]

Okay so I've got a pretty interesting request... I'm working on a military running cadence song in Latin, about to be used by légionnaires in training in the French Foreign Legion.
The task is proving to be rather difficult considering the fact that I don't speak Latin xD

Here's an example of a Legions running song, you can see the tempo:

I was looking for inspiration here:

Also here:
http://www.imperium-romana.org/marching-songs.html

Can someone help?

 

[Glabrigausapes]

I'm working on a military running cadence song in Latin

Do you have something you want translated (as in the French those lads are saying)? Or are we supposed to invent the words?

 

[Darthoniata]

That's actually in Portuguese haha
You see the legion is foreign

No, there's nothing pre-set, I was thinking more in terms of the video from the movie I showed and the website. Stuff about the "eternal legion", "soaring eagle", "be ready to die", something like that... And it shouldn't be very long, you see the running songs are fast.
But the choice is yours really, later I'll upload a video of légionnaires singing it