The Nantucket Series – S.M. Stirling

This alternate history series consists of:

Island in the Sea of Time
Against the Tide of Years
On the Oceans of Eternity

The island of Nantucket and the Coast Guard barque Eagle are mysteriously sent back in time to around 1000 BC. Being too small a society for self-sufficience, the inhabitants (including many seasonal visitors) must go out in the world and survive using technology and cunning. Epic adventure, well researched and well written.

Note: Stirling's Emberverse series is connected to the Nantucket series since the event that sends Nantucket back in time also triggers the "Change" in Emberverse.