Sky History2 Unlocking the Stargates: For centuries, cultures around the world have believed in stargates through which beings have travelled to Earth - but could such portals truly exist? (S16, ep 12) 2026-07-24 Battle of Hastings: In 1066, William of Normandy decided to go to England to claim the crown of England - which ignited a war of succession on an exceptional scale. (S2, ep 1) 2026-07-24 Battle of Marathon: In 490 BC, Persian King Darius the Great sent an expeditionary force to Greece - but the Greeks awaited them there, repelling the invaders in a single battle. (S2, ep 2) 2026-07-24 Battle of Agincourt: In 1415, the finest French chivalry met at Azincourt. Exhausted and outnumbered, the army of King Henry V of England was easy prey - but it all went wrong. (S2, ep 3) 2026-07-24 Battle of Gergovia: In 52 BC, after eight years of warfare in Gaul, Julius Caesar and his legions laid siege to Gergovia - but he faced a coalition of all the Gallic tribes. (S2, ep 4) 2026-07-24 The Catalaunian Plains: Attila, king of the Huns, faces strongman of the Roman Empire, Generalissimo Aetius. But their terrible battle ends in a bloodbath, with no clear victory. (S2, ep 5) 2026-07-25