In this episode of The Rest Is History, the focus is on the Battle of Cape St. Vincent in 1797 and the crucial role played by Lord Nelson. Despite being outnumbered, the British fleet secured a significant victory, thanks in large part to Nelson's bold decision to defy orders. He bravely took on the Spanish flagship, which shifted the battle in Britain's favor and thwarted a potential invasion. However, the episode also covers Nelson's ill-fated attempt to capture a Spanish treasure fleet in Tenerife, where he lost an arm, underscoring the high stakes he faced in his pursuit of glory.