The Pride And The Passion.

During the Peninsular War, Napoleon's armies overrun Spain. An enormous siege cannon, belonging to the Spanish army, is abandoned when it slows down the army's retreat. French cavalrymen are dispatched to find it. Britain sends Royal Navy artillery officer, Captain Anthony Trumbull (Grant) to find the huge cannon and see that it is handed over to British forces before it can be retrieved by the French. However, when he arrives at the Spanish headquarters, he finds that it has been evacuated.