1) The drone of war: marching, rowing chants, etc. increasing intensity as war eminently closes in.
2) Kraken is released and wreaks havoc on the town, approaching his sacrificial offering, Queen Andromeda. Perseus shows the Kraken Medusa's head, which turns to stone and falls.
3)Queen Andromeda is saved, as are the people. This is the celebration of victory and love.