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The Union army's southward march-especially in the Mississippi Valley-stretched supply lines, brought thousands of defenseless ex-slaves under Union protection, and exposed large expanses of occupied territory to Confederate raiders, further multiplying the army's demand for soldiers. On the home front, these new demands sparked violent opposition to federal manpower policies. The Enrollment Act of March 1863 allowed wealthy conscripts to buy their way out of military service by either paying a $300 commutation fee or employing a substitute. Others received hardship exemptions as specified in the act, though political influence rather than genuine need too often determined an applicant's success. Those without money or political influence found the draft especially burdensome. In July, hundreds of New Yorkers, many of the Irish immigrants, angered by the inequities of the draft, lashed out at the most visible and vulnerable symbols of the war: their black neighbors. The riot raised serious questions about the enrollment system and sent Northern politicians scurrying for an alternative to conscription. To even the most politically naive Northerners, the enlistment of black men provided a means to defuse draft resistance at a time when the federal army's need for soldiers was increasing. At the same time, well-publicized battle achievements by black regiments at Port Hudson and Milliken's Bend, Louisiana, and at Fort Wagner, South Carolina, eased popular fears that black men could not fight, mitigated white opposition within army ranks, and stoked the enthusiasm of both recruiters and black volunteers.
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Leslie S. Rowland (Freedom's Soldiers: The Black Military Experience in the Civil War)