Enfilade (and routing in general...) [Napoleonic Battles]

[Mowgli]

Some hypotheses (judging from Bayonets on the Rhine):

In your own turn, you cannot disorder or rout an enemy unit by means of fire power. If you inflict sufficient casualties on an enemy unit, the unit will test for morale (and become disordered or routed eventually) at the start of its next turn. So the effects of your firepower on the enemy are always "delayed". Makes it difficult to hit the enemy hard (and immadiately exploit a gap) by means of fire power.

Your own units, by contrast, can very well become disordered or routed during your own turn due to enemy fire (enemy opportunity fire).

Judging from the detailed (not "on map") combat results, it seems as if skirmisher units do not receive any firepower-bonus when enfilading enemy infantry units (I guess they also don't cause the -2 morale penalty). Ordinary infantry units  get the bonus (20% in Bayonets on the Rhine).

(Side note: Units have no limit on how often they can opportunity-fire, but the fire power per opportunity fire action is only 50% of the normal fire power. This is not mentioned anywhere in the manual).
(Also missing in the manual: Units that rout at the start of the turn immediately move their full movement allowance away from the enemy - units in line change to column for this purpose; skirmishers stay in skirmish formation; In the following turns, routed units can be moved normally, but only at half their ordinary movement allowance and they may not be moved closer to enemy units).