From: Vermont, USA
If you believe that splitting your cavalry into perhaps three groups and sending those groups 50-60 miles in different directions to reconnoitre, the game is spot on.
I brought the subject up,because I believe than in most circumstances and discounting raiding as a seperate option,commanders would want the Cavalry within 5-20 miles(the same region) so that they could report enemy movement and numbers within an hour or two,so that I might react.In which case the game is forcing the player to act in a way that does not make military sense
Ok, here's where you need to use a little more imagination in the context of the game structure and scale. A game has to be playable, so by asking the player to direct his scouting during his turn, you avoid having to have some kind of separate "cavalry phase" to resolve what happens when an enemy army moves in from/through a particular region. You already know that the player's cavalry was paying attention to that direction.
Realistically, the type of scouting that's going on here often went on between battles. Once armies actually start to move to contact, having the cavalry with you adds combat power which sways which side will win the battle. Sending all your cavalry off scouting to find the enemy and then moving into the enemy territory without your cavalry can significantly affect the outcome of the battle. The defender's cavalry always gets to play a part, but the attacker has to conserve enough of his cavalry's movement to allow them to accompany his forces.
Note that since cavalry can both scout and screen in the same turn, it's fair to assume that some of your cavaly is staying with the army. Also, by keeping your cavalry with your attacking army as well as in the region you want to defend, you are allowing them to add to the adjusted combat values of your side and thus infuence the outcome of the battle, regardless of whether they cause any casualties. This reflects the role they play in the period when battle is imminent or ongoing.
As far as I can tell, all the bases are covered as far as historical cavalry effects, tactics and strategies for this scale.