they can attack outside of combat, they are detonated in the assault phase but if it your turn you do not have to be in close combat... i'm almost sure of this reading the rules
thank you for the info on the Trojan, i might do this eventually
I just love these 3 models, the medusa gun on the krieg wheels, the cyclops, and the trojan all working together
Plus i think the medusa would get the reroll to
wound for preferred enemy