In May 1863, the Confederate States Congress passed a law prohibiting the exchange of black soldiers, following a previous decree by President Jefferson Davis in December 1862 that neither black soldiers nor their white officers would be exchanged. This became a reality in mid-July 1863 after some soldiers of the 54th Massachusetts were not exchanged following their assault on Fort Wagner. On July 30, 1863, President Abraham Lincoln issued General Order 252 to stop prisoner exchanges with the South until all Northern soldiers would be exchanged without regard for their skin color. Stopping the prisoner exchanges is often wrongly attributed to General Grant, even though he was commanding an army in the west in mid-1863 and became overall commander in early 1864.