The book was very poorly named, as it has very little to do with slaves or ships. But rather, a near future where a religous Indo-Chinese alliance (called the Caodai) has taken over most of the world (all but the Americas) in the aftermath of a US-Soviet conflict. They call it a cold war, though there is lots of fighting... Pohl seems to mostly be mocking the term. The main character is a Yassarian-like Naval officer, who ends up working with a displaced Soviet (they are 'in exile' in the US) to see if they can learn various animal languages well enough to use them in military operations... seemingly suicide bomber-type missions. Things get urgent as the secret weapon that makes people just drop dead takes it toll.
Of course, it's not that simple. There are strangely named pacifists that seem to be trying to turn the cold war hot... and the caodai seem desparate, too.. but why, if they're winning? Then ending is WAY out from left field.
A very entertaining(probably unintended) precursor to Catch-22, with some really interesting stuff on animal communication, which dominates the first half of the book, and Pohl's afterward.
The down side is it is pretty dated, with no sign of any future tech, despite being far enough in the future for alot of stuff to happen. Very much still a worthwhile read, though.