God of War II - The Great War
It was prophesied that Cronos would be overthrown by his children, and so he swallowed them after they were born. Cronos' wife, Rhea, could not bear the loss of her youngest child and tricked Cronos into swallowing a stone wrapped in cloth. This baby was Zeus, and he would be raised by Gaia until he came of age and decided to take revenge upon Cronos.
Zeus freed his siblings from Cronos and launched a revolt against the Titans, signifying the start of The Great War.
As the war waged on, Zeus forged the Blade of Olympus and used its power to banish the Titans into Tartarus.