Formation attack

[Elianus]

How does it affect gameplay (apart from having your men stay in formation). I mean, does it really impact the result of the battle? Does it make your unit more
or less effective in any way. Also, how does it work for cavalry? I don't notice any visual difference but does it affect their stats or something?
Edit: 666th post

[Dresden]

In Rome 2, turning off formation attack actually gives an advantage to the player in some cases (because the AI never turns it off). I am not sure about Attila.

[shawn858]

IIRC

Turning off formation attack enables your men to wrap around the enemy units flanks if your lines are longer, instead of them staying in a rigid formation, as the name "formation attack" implies.