From Eric Mink:
The summer 1862 occupation of Fredericksburg and Stafford County is a period in the region’s history that receives little attention when compared to the battles and events that followed a few months later. For many of the Union soldiers stationed along the Rappahannock River, the summer occupation proved to be their first real exposure to the South and the institution of slavery. It has been estimated that perhaps as many as 10,000 slaves passed through the military frontier around Fredericksburg to take refuge within Union lines. Termed “contraband,” most of the escaped slaves continued their journey to the District of Columbia and perhaps even points farther north. Others chose to stay with the Union army and secured work and employment in support of the thousands of soldiers that made up the Union’s Department of the Rappahannock. This interaction developed into a working relationship that most certainly left impressions upon the soldiers.
Union authorities set to work using the refugees in a variety of roles. Many found work at Stafford County’s Aquia Landing on the Potomac River, loading and unloading the supply ships that docked there. Still others received employment as drivers for artillery forges and transportation wagons. Compensation for this work varied and as one Union officer stated “the lowest price was one ration and 25 cents per day, and the highest one ration and 40 cents.” Perhaps the largest source of employment found within the army was that of a servant to the army’s officers and men.