Watched my son (Daniel, Britons) play this yesterday. He and his opponent (Peter, Romans) picked it because of the unusual nature of the British forces.
The early battle saw the British chariots thrashing the Roman light infantry. Pete got a bit of a rush of blood and lost a medium calvalry unit in a premature attack.
The PBI (poor bloody infantry) of the Romans had to slog forward, with the Britons evading every attack they could, but being pushed back towards the board edge.
The game changed when Ceasar, with a medium infantry unit, seperated from the battle line. Three chariot units attacked it, hoping to wipe out Ceasar. This was not to be. Ceasar urged his men forward, and with the benefit of an additional die to battle back attacks, wiped out the the chariots, taking loses as he did so, but coming out victorious.
Definately a game of two halves. The Romans just have to suck up the damage as his infantry advance, but then go in for the kill when the Chariots can evade no further.
Romans 6, Britons 5.