The North York mission is the 2nd mission of ''The Normans'' campaign. After you take over the second town, the Danish will raid you continuously, the game will give you a choice between sending a gold tribute of 1200 gold or destroying them. Before attacking them, make sure you have a big army with a lot cavalry to counter their infantry. After you beat them, 2 chests with 300 gold in each of them will be available to grab inside the Danish camp (watch the video below at 21:00 for reference).
North To York Mission: