I have found all the pieces of this Viking artillery set, and it is ready to go to a new home. This model spent a few years sitting on an east-facing window ledge, and some of the pieces have been a bit discoloured by the sun, such as the horns on the warriors' helmets, but I think this adds an appropriate aesthetic that is fitting for Vikings. I do not have the original box the set came in, nor the instruction manual, but this can be found online.
eBay