Hook - whilst it would be expected of cavalry to go raiding in the 1861-65 War between the States this is not what is to be expected of regular cavalry in the Napoleonic period (with the possible exception of cossacks).
A mass breakthrough the enemy battle line by a corp of cavalry is one thing but an odd regiment losing contact with the rest of the army is another. Small forces of cavalry behind the enemy line really ought to concentrate on finding their way back to their commander. They tend instead to go looking for targets and possibly the lop.
Not that I have any problem with leaving reserves to deal with these.
I don't know what the policies and doctrines were on Napoleonic raiding parties, but we're talking about something different here. You're the leader of a cavalry unit who has found himself behind enemy lines, totally unintentionally. You look around and find there's no way to get back to your lines without going through masses of enemy, and you aren't going to make it. What do you do?
From everything I've read about the cavalry mindset of the time, they'd take advantage of the situation. As their commander in chief, this is what I want them to do.
"A cavalryman despises life..."
"A hussar who lives to age 30 is a jack@$$."
Hook