The answer is probably the testudo formation if they put it in. aka a square with shields overhead fully closed in. that being said I really hate having to put my archers on hold fire when the enemy sends out their 5 something horse archers because if I forget while I'm chasing them down they will actually run out of ammo before they kill them half of the time. also, someone should do something about the ai turning the formation automatically they need to turn individuals direction but not change the formation. IDK why that's so hard but other games like total war do it as well. its a huge waste of time for a loose formation to rotate when the people in it could just turn around so much faster.