After his conquest of Gaul, Julius Caesar looks over the sea and resolves to order Britain to swear obedience and pay tribute to Rome. His commands are answered by a letter of refusal from Cassivellaunus. Caesar sails a fleet to Britain, but he is overwhelmed by Cassivellaunus's army and forced to retreat to Gaul. Two years later he makes another attempt, but is again pushed back. Then Cassivellaunus quarrels with one of his dukes, Androgeus, who sends a letter to Caesar asking him to help avenge the duke's honour. Caesar invades once more and besieges Cassivellaunus on a hill. After several days Cassivellaunus offers to make peace with Caesar, and Androgeus, filled with remorse, goes to Caesar to plead with him for mercy. Cassivellaunus pays tribute and makes peace with Caesar, who then returns to Gaul.