Though Posthumus came over to Britain with the Roman army, he did not mean to fight on their side against his own countrymen, but intended to join the army of Britain, and fight in the cause of his king who had banished him. He still believed Imogen false to him; yet the death of her he had so fondly loved, and by his own orders too (Pisanio having written him a letter to say he had obeyed his command, and that Imogen was dead) sat heavy on his heart, and therefore he returned to Britain, desiring either to be slain in battle, or to be put to death by Cymbeline for returning home from banishment.
Imogen, before she reached Milford-Haven, fell into the hands of the Roman army; and her presence and deportment recommending her, she was made a page to Lucius, the Roman general.
Cymbeline's army now advanced to meet the enemy, and when they entered this forest, Polidore and Cadwal joined the king's army. The young men were eager to engage in acts of valour, though they little thought they were going to fight for their own royal father; and old Bellarius went with them to the battle. He had long since repented of the injury he had done to Cymbeline in carrying away his sons; and having been a warrior in his youth, he gladly joined the army to fight for the king he had so injured.
And now a great battle commenced between the two armies, and the Britons would have been defeated, and Cymbeline himself killed, but for the extraordinary valour of Posthumus, and Bellarius, and the two sons of Cymbeline. They rescued the king, and saved his life, and so entirely turned the fortune of the day, that the Britons gained the victory.
When the battle was over, Posthumus, who had not found the death he sought for, surrendered himself up to one of the officers of Cymbeline, willing to suffer the death which was to be his punishment if he returned from banishment.
Imogen and the master she served were taken prisoners, and brought before Cymbeline, as was also her old enemy Iachimo, who was an officer in the Roman army; and when these prisoners were before the king, Posthumus was brought in to receive his sentence of death; and at this strange juncture of time, Bellarius with Polidore and Cadwal were also brought before Cymbeline, to receive the rewards due to the great services they had by their valour done for the king. Pisanio, being one of the king's attendants, was likewise present.