On May 24, Confederate Maj. Gen. Fitzhugh Lee's cavalry division (about 2,500 men) attacked the Union supply depot at Wilson's Wharf, on the James River in eastern Charles City, Virginia. They were repulsed by two African American regiments (about 1,100 men) of the United States Colored Troops (USCT) under the command of Brig. Gen. Edward A. Wild, who were in the process of constructing a fortification there, which was subsequently named Fort Pocahontas. The battle was the first combat encounter of Robert E. Lee's Army of Northern Virginia with African-American troops.