Over the past twenty years, William 'Bull' Kelly has acquired a reputation as one of the best ramrods in Texas. He has led legendary cattle drives to almost every railhead in the middle of the country. But after years of working for other people, he decided to run cattle with his five sons. When a group of cattle thieves try to stampede the herd, some of Kelly's sons are hurt in the melee. The rustlers quickly find out that Kelly isn't called 'Bull' because he insists on riding at the head of the herd, but for his skill with the harsh whip coiled on his belt.