It has been inaccurately claimed that the Emancipation Proclamation did not free a single slave; historian Lerone Bennett Jr. alleged that the proclamation was a hoax deliberately designed not to free any slaves. However, as a result of the Proclamation, many slaves were freed during the course of the war, beginning with the day it took effect; eyewitness accounts at places such as Hilton Head Island, South Carolina, and Port Royal, South Carolina record celebrations on January 1 as thousands of blacks were informed of their new legal status of freedom. Estimates of how many thousands of slaves were freed immediately by the Emancipation Proclamation are varied. One contemporary estimate put the 'contraband' population of Union-occupied North Carolina at 10,000, and the Sea Islands of South Carolina also had a substantial population. Those 20,000 slaves were freed immediately by the Emancipation Proclamation." This Union-occupied zone where freedom began at once included parts of eastern North Carolina, the Mississippi Valley, northern Alabama, the Shenandoah Valley of Virginia, a large part of Arkansas, and the Sea Islands of Georgia and South Carolina. Although some counties of Union-occupied Virginia were exempted from the Proclamation, the lower Shenandoah Valley, and the area around Alexandria were covered. Emancipation was immediately enforced as Union soldiers advanced into the Confederacy. Slaves fled their masters and were often assisted by Union soldiers.