For the Hell Dining Badge I just used 1 full missile tower and 1 partially full one, then get a shotgun and upgraded reload and 4 carpenters.
This is provided by Miganiya
Good tactics, I used similar. Actually, you don't need carpenters, tho. If you upgrade damage and reload on your shotgun high enough to back off those who pass through the rain of missiles, none will reach the fence. Then just use the rest on missile number on the second turret.
- Purchase fan, place in middle, fully upgrade all stats for fan
- Place 2 flamethrower Joes around the fan and fully upgrade them
- Purchase as many gunman as possible
- Watch as all 300 Spartans are killed without you having to do anything.