Miners do not have to be deployed on the table at the beginning of the battle.

Instead, starting from turn two, at the beginning of every Dwarf turn roll a dice: on a 4+ the Miners will arrive. For every successive turn after the second, add a further +1 to the roll, so they arrive on a 3+ in turn three, and so on (but an unmodified roll of 1 is always a failure).

In the Movement phase of the turn when they arrive, Miners can enter the battlefield from any table edge and will be treated exactly like a unit that has pursued an enemy off the table in the previous turn. If the Miners fail to turn up for the entire game, they have obviously got lost in the tunnels, but their points value are not awarded to the opponent.