The Byzantines made the usual flank manoeuvre, this time stacking their left.
In the pic the Byzantines are on the left.
The Sassanids tried a pre-emptive strike at the Byzantine centre. This was going ok, but the Byzantine flank attack worked better.
The Sassanid reserve partially stemmed the tide, but there were too many Byzantine units & some got throught to hit the rear of the Sassanid attack before it could break through.