Tactician card - reaction charge

I think it is a reasonable card to have. Counter charging cavalry in the Napoleonic wars were common enough and a reason why most miniatures wargames rules contain such rules. Two very simple examples are the continuous counter-charges between French & Russian cavalry at Borodino and of course the French Cuirassier and Polish Lancer counter-charge of the British heavys at Waterloo.

I do actually think I am going to word it so that any unit type moving in the reaction zone may be targeted. so...

Opportunity Charge

May be played when opponent moves a unit within two hexes of your cavalry unit. You may move the cavalry unit one hex adjacent to the moving unit and stop its movement. Initiate a combat immediately as the attacker before resuming the remainder of opponents movement phase. You may not play this if terrain would prohibit the cavalry unit from attacking.

Decided that this being a hasty charge, not enough impetus to give a 1 bonus die.

also note that no additional tactician cards could stack on this, so no break the square, etc...