Iron Gray Sea (Destroyermen, Bk. 7)

War has engulfed the other earth, the parallel universe that Lt Commander Matt Reddy and the crew of the USS Walker now call home. With every hard-won victory and painful defeat, Reddy and the Allies encounter more friends—and even more diabolical enemies.
 
Cutting short his “honeymoon,” Reddy sails off in pursuit of Hidoiame, a rogue Japanese destroyer that is wreaking havoc in Allied seas. Now that Walker is armed with the “latest” technology, he hopes the four-stacker can handle a straight-up fight against the bigger ship.
 
Elsewhere, the long-awaited invasion of Grik “Indiaa” has begun, and the Human-Lemurian Alliance is pushing back against the twisted might of the Dominion, even as political machinations threaten the Alliance from within. But the savage Grik have also mastered “new” technologies. And their fleet of monstrous ironclads and a bloodthirsty army are finally massing to strike...