Hi Drakken!
I can say with experience that I have made moves during the military/reinforcement phase, then saved the game, exited WW1 Gold and returned later after loading the save and all my moves were preserved. No issue.
This is a great thing because sometimes there are not enough minutes in a day to play through the combat resolution so I frequently make my moves, save then come back when the wife has stopped bothering me to do chores! LOL
