D'Amato. The military might of the Roman Empire was not limited to their ground troops, instead incorporating the world's most advanced navy — responsible for securing trade routes and maintaining communication lines. This second in a two-book series examines the naval force from 193 AD to 565 AD, after the Marcomannic Wars marked the end of a peace and the beginning of seemingly constant warfare. 48 pages, illustrated, 7"x 10", softcover.