Thor: Heaven and Earth (2011 series) #4

An American travel writer is stranded aboard a train in Wales by a sudden snowstorm. A local man tells him the country was originally called Gwynedd and offers to tell him a story:

Rhodri of Gwynedd stole the wife of a Norseman who came with his army to take her back. There was a skirmish but the Welsh men appealed to the Red Dragon of Dolgellau, Y Ddraig Goch. They supplied him with four young women as a sacrifice, asking him to fight for their people. So the Dragon ate the sacrifices and flew out to slaughter the Norsemen. They were all killed but one managed to send a prayer to his gods before he died….

And so, the Norse gods arrived: Thor, Odin, Vidar, Balder, Heimdall, Hermod, and Agnar the Fierce. There is a battle occupying half the issue, ending with the Dragon defeated. But Odin stops Thor from killing such a cunning and mighty foe. Odin exacts a promise: the Dragon will stop requiring blood sacrifices and have Rhodri return the woman he stole….

The local man reaches his stop and gets up to leave. The American wants to know what happened next. The local says that Rhodri tasted better than the women. Stunned, the American rushes after him but only sees the dragon flying off into the distance….