you were on your Skimwing with a lot of your fellow Metkayina's, you all wait while Jake slowly goes forwards on his Skimwing towards the seadragon/RDA ship, and after a bit a Tulkun came out from the water and flopped onto the ship, killing a lot of the RDA soldiers, then the Na'vi see this the Skimwings go into it's flight mode and the Na'vi and the RDA start to fight. The war has began.