Order of battle:
1. General Scipio sends his phalanx mercenarys to hold the enemy at bridge while all of his velites and missile units throw/shoot their missiles at enemy
2. After missiles are shot, light troops retreat behind principe lines and Italian mercenaries start shooting their owns. Italians slowing enemy Hastati shoot their missiles
3. Mercenary lines are broken and know its Hastati`s time to fight the enemy. Principes shoot their missiles.
4. Both Hastati and Principe units are fallen back and its time to send Velites and other light troops to support line.
5. With support from lighter troops, Line holds long enough Triarii to join the fight. This is where enemy attack is driven back.
6. Second wawe of enemies is coming from bridge, and some units have found their way across river, and Romans are now flanked. General Scipio acts cuickly and pulls his veteran Triarii out of bridge. Flanking enemy troops are cuickly surrounded and destroyed.
7. General Sextus Scipio know flanks enemy same way they came.
8. Enemy is completly suprised, and have no time to counter Roman flanking move. Bridge is know surrounded by Roman forces, and massacrace begins.