Juliet Barker reconstructs Henry V's 1415 campaign in France and the famous Battle of Agincourt using chronicles, financial records, letters and contemporary evidence. She follows the English army from recruitment and preparation through the siege of Harfleur, the exhausting march across northern France and the confrontation with a much larger French force. The book explains weapons, tactics, leadership, logistics, disease and the experiences of ordinary soldiers as well as nobles. Barker also examines the political ambitions behind the invasion and challenges legends that later grew around the victory. Detailed yet accessible, the history places the battle within the realities of medieval warfare and shows why Agincourt became one of England's most enduring national stories.