Here is a short plot summary of Henry V:
The English take the town of Harfleur and the king moves on towards Calais. The two armies prepare for battle near Agincourt. The night before the battle the king visits his troops in disguise. The French numbers are superior but Henry inspires his troops with a powerful patriotic speech. The battle begins and the French are defeated, with heavy losses, whereas the English losses are light. Henry returns to London in triumph before making peace with the French king. Henry woos the French Princess Katherine and their marriage links England and France.