I really enjoyed this story - the USS Walker is an old World War one era four stack destroyer with the Pacific fleet in World War Two. Its 1942 and allied forces are being pushed back by the Japanese. The USS Walker is under attack and being pursued by a large Japanese force so hides in a squall, but this takes the ship and its crew to an alternative Earth where their are no humans but two races at war, (and a sea full of huge prehistoric beasts.) The Crew take sides and help fight, and even though their ship is old and out of date in 1942 is better than anything in this alternative world where their are no engines, machines or guns. Just sailing ships, crossbows and swords.
This is the beginning of a very promising series. If you like S M Stirlings or John Birminghams books you will like this too.