The Two-Space War Hardcover by Dave Grossman, Leo Frankowski

It is six hundred years in the future and mankind has learned to move between the stars … by going into Two-Space, the vast realm where sentient wooden ships travel beneath canvas sails in a universe that is corrosive to technology.

As they charged headlong into the galaxy, humans discovered others who were already there: The elven Sylvans who live in the vast forests of low-gravity worlds, the dwarven Dwarrowdelf who thrive deep in the mines of high-gravity worlds, and other, far more alien races. The ancient Sylvan race is enchanted by the human culture, embracing Tolkien as prophecy and taking "classic" human science fiction as a guide.

Against this stellar backdrop, Lt. Thomas Melville's ship is mortally wounded in a cowardly surprise attack. With his captain killed, Melville must capture a feral, sentient enemy ship, then fight his way across the galaxy to warn of the vast invading armada. In an odyssey of turmoil and battle he forges his ship and crew into a mighty weapon of war and earns the love of an alien princess. Now, if he can only survive the attacks of two very angry alien empires, and avoid being court martialed by his own nation of Westerness for getting them involved in a vast intergalactic war, he might live to enjoy the fruits of his labor.