1) Load treasure onto our boat
2) Take a quick look into the "sea" that the treasure has been tossed. The monks are dumping it on the beach, not the middle of the ocean. There might be a couple hundred pounds of gold and silver 10 feet into the surf. It's worth checking.
3) Do we gave a home base? I don't see one on the map.
3a) If we do, then take our dead with us and return home so that we may give them proper burial, inform their women, revel in our good fortune, etc.
3b) If we don't, then burn the dead. All of them. Do this last, so that we're not setting off a massive smoke signal to the world while we load treasure onto our boat. Pyre is last thing we do before we leave.
* It gives proper respect to our fallen friends so they don't haunt us
* It keeps morale high, since those still alive will know they're not simply being used and discarded
* It hides our losses to whomever comes looking for us. If they find a massive pile of burned corpses, it looks like we simply came in and slaughtered everyone. If they find lots of viking corpses, it tells them that we can be defeated, and are weaker now than we were.
4) If we don't have a home base, then return to the monastery and start building defenses. Also, look for nuns. We will need women to breed more vikings.