Easiest strategy for sparta, 3 fully upgraded quake boxes, the rest all on gunmen. The spartans don't even get halfway and you don't have to do a thing.
Beyond Clicking
Dude! You just completed the Beyond Clicking achievement in Areas and won the Beyond Clicking badge and 30 points!
This takes FOREVER!!!
 "Storm the House 3"){kind=icon}
 "Areas"){kind=icon}