Being fired on in the rear (at effective range or less by close order or artillery) is a cause for a morale check in itself.
On the subject of enfilades, we have had discussion about whether the enfilade bonus applies to column. I'd say yes, but others said it would be like firing at the face of a line (even though it'd be only perhaps 18 ranks deep and still 30 or so men deep). I guess the depiction of the troops explains the discrepency in view.
Swampster