Can I book about a modern day island on the American east coast (Nantucket) going back in time be boring? Yes. And for an isolated island with minimal supplies there is a lot of traveling going on - to Europe, to the Caribbean, South America. I know the author didn't want to bog down the book with descriptions of days and days of travel, but sometimes it seemed they were one day in Nantucket and then after waiting a week (no real sense of urgency - just we're going as fast as we can?!), it would take them about a day or so to get to the baddies.
And I'm sick of reading that every battle between native and more civilized forces being compared to the Anglo-Zulu War. Catherine Asaro did a much better job with a comparison of this conflict. The "final" battle was confusing because I kept thinking, "Are they with the Eagle people or the Wolf people?"
Anyway, I didn't enjoy this book much at all.