Quoted from the Thor showcase:
A Norse player who loses his or her infantry is effectively dead, so the civ's most basic infantry, the ulfsark, can be trained from nearly anywhere, including the town center and the Norse barracks, the longhouse. Street even indicated that you can train them from some ships or through a god power.
Imagine this: you're fighting the typical grush style on an islands map, and you've decided to invade your opponents mainland. No transports? No problem! Just send over some ulfsark-training boats and begin cranking them out. Build a longhouse over there or just fight with them (or both Now what about the limitations on this ability? Will this be something available as a mythological improvement of a certain minor god? Or maybe will it be the major god "civ bonus"? Will you build them from a military boat or a transport? And what about that god power?
"It may come as a shock to you . . . You can have fun and be serious all at the same time."