I’ve been testing a bug that occurred to me with my units, and I found that if you select them using the select all military units shortcut and order them to attack something, and that something is eliminated or enters the fog war, all the selected units have your movement stopped immediately, causing all your military units to stop and scattered across the map, forcing you to select them manually if you want to avoid the inconvenience
So press control shift c and then right click where you want them to go. To be honest though. I’d rather my units keep running to where the enemy last was, rather than stop if vision is lost or if it dies.