Just finished reading the third book of a trilogy:

The basic premise is a combination of a historical war novel with a sci-fi twist. A modern day (actually slightly futuristic) group of warships gets transported back in time to the middle of World War II with interesting consequences.
John Birmingham is an Australian author, with his own blog, newspaper column, and a series of popular books.
I'm pleased to say that the Axis of Time trilogy was worth every second. I highly recommend it.