Casca steals a Southampton criminal’s girl and escapes retribution by joining King Henry V’s army assembling nearby for a campaign to France. Disguising the girl as one of their band, Casca and his new comrades are soon embroiled in a lengthy siege where the fighting bogs down amongst the fortifications. Casca soon learns that the French are not his only opponents, for the criminal has sent an assassin after him and the girl as punishment for their actions.
As the rains of autumn arrive, the English army embarks on a long trek to safety, harassed by converging French armies, and the eternal mercenary must use his centuries of combat and survival skills to protect the girl from the danger closing in on them.
Riddled with disease, the English realise they will have to turn and fight for their lives even though they are outnumbered and without food, but Casca and his comrades have the one weapon the French rightly fear, the longbow, and on a rain-sodden field in northern France they will take part in one of the battles that will echo down the ages in folklore.