This was Ben Bova's first book. It was published as part of the famous Winston Sci-Fi Series and was the best book of the series. I've read most of Mr. Bova's works over the years, and while this was his first, it is still about the best thing he ever wrote. In later years, he tended to develop the tendency to pad his writing.
Star Conquerors, on the other hand, was a great action adventure than spanned the galaxy. When the Terran Empire is invaded by "the Masters", it appears that all is lost. But one man leads a fleet of ships against incredible odds and by genius, luck, new inventions, and indomitable character, overcomes the hordes of invaders and eventually reaches the center of the Galaxy to confront the Masters. There are enough twists and turns to keep you enthralled and the surprise ending is first class. - from "a fan".