In May 1861, three enslaved men who were determined not to be separated from their families ran to Fort Monroe, Virginia. Their flight led to the phenomenon of Civil War contraband camps. Contraband camps were refugee camps to which between four hundred thousand and five hundred thousand enslaved men, women, and children in the Union-occupied portions of the Confederacy fled to escape their owners by getting themselves to the Union Army. Army personnel had not envisioned overseeing a massive network of refugee camps. Responding to the interplay between the actions of the former slaves who fled to the camps, Republican legislation and policy, military orders, and real conditions on the ground, the army improvised. In the contraband camps, former slaves endured overcrowding, food and clothing shortages, poor sanitary conditions, and constant danger. They also gained the protection of the Union Army and access to the power of the US government as new, though unsteady, allies in the pursuit of their key interests, including education, employment, and the reconstitution of family, kin, and social life. The camps brought together actors who had previously had little to no contact with each other, exposed everyone involved to massive structural forces that were much larger than the human ability to control them, and led to unexpected outcomes. They produced a refugee crisis on US soil, affected the course and outcome of the Civil War, influenced the progress of wartime emancipation, and altered the relationship between the individual and the national government. Contraband camps were simultaneously humanitarian crises and incubators for a new relationship between African Americans and the US government.