I, likewise, didn't read the whole thing; only a couple of pages.
There are aspects to it that work well, and some issues I think need tightening.
On the positive side, your prose, generally, flows well. There are few errors of language that pulled me out of the story.
However, there were other elements that made me feel it could have been better. The first, of course, was the date itself. Seeing it, my first response was to ask "January? Really? 49BCE?" So, off to Google, and then Wikipedia, we trundle to look up the Roman Calendar. I'll not bother repeating what I found there; I'll only say that to make a story immersive, an element such as the dating of the events should be rendered in-setting. Is it the 6th of Jan, or the 6th day of Winter? (There are tools that would allow you to figure out when the lunar cycles of the preceding year began, and thus align.) If you want it to actually be 6 Jan, per the Gregorian calendar, and convery this, then start with the in-setting date, then translate it in parentheses.
The second question that came to mind was one of discipline. Yes, this army is returning home (but has been stuck in this one camp for a while, which doesn't make sense), but the Roman army was renownded for its discipline. Would the men really be so lax? Would Quintus abandon the task he had been set and go talk randomly with fellow soldiers without reporting back? This detail bugged me, demanding an explanation, which wasn't forthcoming…