The Archbishop convinces King Henry V to stop the legislation and go after France instead. King Henry is willing to take the throne of France with whatever it takes so Henry first sends word to the French court asking nicely.

The Dauphin responds by sending an ambassador back with a gift of tennis balls which outrages Henry but also convinces him that he must wage war against France to get what he wants so he arranges his army.

In arranging his troops, King Henry V leaves enough men behind in England incase there are any uprisings that may erupt while he is away which means his invasion force will be small. The French conspire to assassinate the King and pay threeof Henry's Lords, Lords Cambridge, Scroop, and Grey to kill him before he ever crosses the Channel.

The three turn-coats are discovered and the King makes an example out of them and has them executed.

The King's army invades Harfleur and captures the city at the price of heavy losses. Henry wants to get his men out of France before the winter season starts but the French want to teach the young king a lesson and prepare for a decisive battle and Henry won't let them down. Before the battle, King Henry disguises himself as one of the soldiers and walks and talks with his men before the battle begins.

The next day, King Henry makes the moving St. Crispin's Day speech at Agincourt, knowing full well that his army is outnumbered five to one.

King Henry and his men make the battle hell for the French and the French decide to sue for peace.

King Henry grants the French peace but in the terms of the Treaty of Troyes, the king will marry Princess Katherine of France and will be named as heir to the French throne. Shakespeare's play ends on the note that England and France will be united in peace.