not understanding something.....

[Steelwhip]

Just started playing Peninsular War. my first Nap title. 

can someone explain to me why, in a single turn-every single one of my French units i tried to move from Column to Line Disordered and one even Routed?

not seeing anything in the manual that would explain it

Also....does a unit have to be stacked with a leader to recover from being Disordered?

thanks in advance