After a more careful reading of the V 2.0 rules and running through a couple of turns of Rolica, I have a bunch of questions and comments. Given the rest of the system, this appears to create a race of supermen and makes the game extremely difficult for the French in ways that appear ahistoric. More on this subject later.
Some cards allow offensive bombardment.
It would appear that a unit in column can move 5 MPs and convert to line, obviously leaving no MPs. But what about a column that spends 4 MPs and then converts to line. The rule prohibiting artillery from taking losses when stacked with infantry effectively prohibits counterbattery fire in those cases. Mixing the voluntary and involuntary retreat rules in this single case appears to have caused more confusion than keeping them distinct. Personally, I see no reason to prohibit such a move.