The Angelo Script thing sounds good, but the way i've found for attacking NPC's is to send the same amount of trans and ballistae + warriors i.e. LVL5 NPC = 500 trans, 500 Ballis + 500 warriors... You lose the warriors, but they are cheap to replace, and you get a lot of experience for your hero, and some prestige... as well as this, you dont lose ANY ballis or trans (As long as ur HBR is 1 level lower than your Arch, this way they can start shooting before they get into range of the archers towers, and decimate a lot of the troops... imagine the warriors as a human sheild of sorts XD)