He followed Zhu Yuanzhang from Huai Xi and won countless military honors, only to be branded a “criminal minister” and exiled to Liangzhou. Of the nine commanders before him, four died in battle and three were dismissed. He, however, cut off Northern Yuan's right arm in a single campaign, capturing 18,000 prisoners and forcing the tribes of the Western Regions to submit. Zhu Yuanzhang trusted him, and Zhu Di went even further, marrying two of his own daughters to the man's sons in exchange for the Song family guarding the northwest for fourteen generations. The History of Ming records the verdict: “He achieved the feats of Wei Qing and Huo Qubing.” From enlisting at the age of ten to rivaling Wei Qing and Huo Qubing in military glory, beneath Liangzhou's yellow sands lies the hardest backbone of an empire.
It's a good book about attacking the unjust.