Berserker Wars — Fred Saberhagen

"LIFE AND DEATH IN DREADFUL CONFLICT STROVE..."
It happened long ago and far away. Perhaps in this galaxy, perhaps in one close by. Two war-maddened races fought -- and though both are gone, their legacy abides: the Frankenstein weapon that destroyed not, only the enemy, but the creator. The Berserkers, robotic, asteroid-sized killers programmed to one purpose: to seek out and end life. The death machines have harried their way across our galaxy. Now they have come for us.

Here at last is the essence of the Berserker Saga in a single volume: THE BERSERKER WARS