On April 6, cavalry under Phil Sheridan effectively cut off three corps of Lee's army, near Marshall's Crossroads while the Union Second and Sixth Corps approached from the east. In three distinct engagements, the Federals overwhelmed the defending Confederates, capturing 7,700 men and depriving Lee of roughly one-fourth of his army. Among the prisoners were six Confederate generals including Richard S. Ewell, Joseph Kershaw, and Custis Lee, the commanding general's son. To President Jefferson Davis, Lee wrote, "a few more Sailor's Creeks and it will all be over." Lee surrendered three days later.