I saw in RockBlocks how the map-maker used the Yamato Cannon effect to make it look like a meteor. I am guessing he had a computer controlled BC off screen with Yamato Researched, but how do you it to A- Attack using Yamato and B- Attack at all (Using the 'Attack' order makes them walk to the set location and retaliate IF ATTACKED. So it's not truely an attack order, it's a 'Move here and attack back if you get attacked' order...)