The Triplex Acies was the triple battle line employed by roman legions. This formation was the key to Roman military success! It allowed legions to traverse rough terrain while maintaining cohesion and provided a system for reinforcement in battle that provided incredible staying power.
I hope you enjoyed this historical video about the Roman military machine!
Make sure to check out my series on the First Punic War: http://www.youtube.com/watch?v=HOk6ppoQrkw
There are many competing theories as to how the Roman forces may have deployed. It's extremely speculative as we have no definitive description from history. I strongly recommend checking out this site which goes into huge depth on this topic: http://garyb.0catch.com/site_map.html
"The Fall of Carthage" by Adrian Goldsworthy
"In the Name of Rome" by Adrian Goldsworthy
"The Rise of Rome" by Anthony Everitt
The gameplay comes from Total War: Rome 2
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For official videos: http://www.youtube.com/user/thecreativeassembly