In the aftermath of the Battle of Shrewsbury, Northumberland learns of the death of his son. The Lord Chief Justice attempts on behalf of the increasingly frail King to separate Falstaff from Prince Hal. The rebels continue to plot insurrection. Falstaff is sent to recruit soldiers and takes his leave of his mistress, Doll Tearsheet. The rebel forces are overcome. This brings comfort to the dying king, who is finally reconciled to his son. Falstaff rushes to Hal's coronation with expectations of high office.

Henry V has settled onto the throne and has the makings of a fine king when the French ambassador brings a challenge from the Dauphin. Inspired by his courtiers Exeter and York, Henry swears that he will, with all force, answer this challenge. The chorus tells of England's preparations for war and Henry's army sails for France. After Exeter's diplomacy is rebuffed by the French king, Henry lays a heavy siege and captures Harfleur. The French now take Henry's claims seriously and challenge the English army to battle at Agincourt.