This film retells the legendary true story of one of medieval history's greatest military heroes and one of his greatest victories, when he helped Portugal utilise cutting-edge battle and defensive tactics, using only 6 600 soldiers, most of them peasants. Against a massive Castilian and French invasion of 31 000 soldiers and french cavalry, who were dealt a crushing and humiliating defeat.

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Recapturing the emotions and atmosphere through three of the major battles and city siege.

Revealing secrets and intrigue, intercut with dramatic re-creations of personal stories taken from chronicles, to explain how these strategies evolved and why they became so effective against massive odds. Tactics that are still taught in top military academies.