Was George Orwell an Optimist?
Abdullah Ibrahim - Water from an Ancient Well
could players potentially split up the total number of dice between those who are attacking a general?
The players who are fighting the general each resolve their own dice in turn. It is possible for a player to aid another player's roll, with a card that allows re-rolls for example, but you don't can't just distribute the dice amongst players.
 I said "in turn", but note that the player whose turn it is determines the order in which participating players attack.