And the White Witch was the previous saloon owner before the Pevensies came to town! And Peter got the job as sheriff and, like, ran her out or something. Possibly she ran a brothel. *considers* Of course, what kind of frontier town is it without a brothel? Although I can't really see Susan running one.

And Peter is a Civil War vet; their parents were killed in the war and after Peter came home, he took his siblings out west to get away from the destruction wrought by the war and ended up in Narnia by accident when their wagon broke down or something. Some of the locals (the Beaver family! A nice old couple who've lived in Narnia a while now) recognized him as a good guy and begged them to stay and help free them from the White Witch's hand; Peter and her pet sheriff, Maugrim, got in a fight and Peter killed Maugrim. And Aslan is maybe the governor of the territory and he hauls the White Witch off to prison?