Cavalry Leader

1: Only one Tactician Card (or special rule) increases the attacking Cavalry dice against a INF into square (Break the Square).
(Rectification of my first answer here, because i didn´t remembered the BsS card)

2. And yes, you play this card if the melee is announced, but then the attacked INF may choose to go into square, and this card is lost
Similar card and result is "Battlefield Smoke", because this card negates also all increasing dice cards/rules of the attacker (so these cards are also lost)

Also, if played before a cavalry charge is "bounced" by a square, is the card lost or put back into the player's hand?

Does this card over rule the normal limit of 1 die when attacking squares? The GMT book states that Tactician cards trump the rules "in this book", but what about the base game rules?