A massive defeat (on VH/VH) prompted me to change my Romani tactics somewhat. I typically deployed in a three-line infantry formation, plus Accensi and Leves at the front (so 4-5 lines, really) and cavalry on the flanks. I found all too often that the Carthaginian enemies I was facing were decimating my infantry with their javelins before charging in and ripping me to pieces. So Cn. Cornelius Scipio Asina sailed back to Iberia with a fresh army and Consular imperium to try out a new tactic...and it worked.

Code:
              [----Skirmishers][Skirmishers----]
                   [Alae]   [Hastati]   [Alae]
                   [Alae]  [Principes]  [Alae]
    [Alae Cavalry]     [Triarii][Rorarii]     [Roman Cavalry]
                           [General]
The skirmisher line was placed in a long, loose formation, with Guard Mode and Fire At Will on but Skirmish mode off. The enemy charged my skirmishers and got bogged down in combat with them before my front line of infantry charged through the skirmisher formation. The skirmishers fell back once the infantry were engaged and threw the last of their javelins at the enemies.

In the end, the heavy infantry was largely unhurt but my skirmishers and cavalry took quite a hit. No biggy - those are easy to find, and by replacing the skirmishers with better variants (Peltastai come to mind) they should sustain fewer casualties.