If those units were on skirmish-mode they probably wouldn't engage? Should turn that off automatically if you order them to charge though.

My biggest wish is a tool to go through all agents and armies outside cities with movementpoints remaining. I've forgotten to move units too many times to count. It's too much like work to go over every inch of map to check all units. The existing tool takes you on a tour of all your garrisons too and that's just too annoying.