The Arsenal of Miracles — Gardner Francis Fox

OUTCASTS OF THE STARS

When Earth's stellar empire was attacked by the Lyanir, a powerful race from the uncharted stars, it was Bran Magannon, High Admiral of Space, who met their battle-challenge. He saved the Empire, but he also fell in love with the beautiful young Lyanirn queen Peganna, and to the people of Empire his name became that of traitor. Now he was a lone, brooding outcast among Empire's outpost worlds, called Bran the Wanderer.

Then Peganna of the Silver Hair returned and told him of a fabled cache of deadly weapons left eons ago by the long-dead race of the Crenn Lir. She wanted those weapons for her people, to use against Empire if need be.

Bran the Wanderer laughed, and showed her how to find them.