I'm trying to complete the seemingly simple task of attacking the independent province next to me, task 23 of 26. I scouted it. Now I am trying to attack with 50 swordsmen and 47 archers, my whole army. I'm following the little green arrows. Clicking "all" to use my whole army. When I click attack it gives me an error message that says "you must attack with all your present army" - but THAT IS my entire present army.
I don't get it...help.