Tavern (May 11) and then continued their raid toward Richmond, leaving Grant and Meade without the "eyes and ears" of their cavalry. Near Spotsylvania Court House, fighting occurred on and off from May 8 through May 21, as Grant tried various schemes to break the Confederate line. On May 8, Union Maj. Gens. Gouverneur K. Warren and John Sedgwick unsuccessfully attempted to dislodge the Confederates under Maj. Gen. Richard H. Anderson from Laurel Hill, a position that was blocking them from Spotsylvania Court House. On May 10, Grant ordered attacks across the Confederate line of earthworks, which by now extended over 4 miles (6.5 km), including a prominent salient known as the Mule Shoe. Although the Union troops failed again at Laurel Hill, an innovative assault attempt by Col. Emory Upton against the Mule Shoe showed promise. Grant used Upton's assault technique on a much larger scale on May 12 when he ordered the 15,000 men of Maj. Gen. Winfield S. Hancock's corps to assault the Mule Shoe. Hancock was initially successful, but the Confederate leadership rallied and repulsed his incursion. Attacks by Maj. Gen. Horatio G. Wright on the western edge of the Mule Shoe, which became known as the "Bloody Angle," involved almost 24 hours of desperate hand-to-hand fighting, some of the most intense of the Civil War. Supporting attacks by Warren and by Maj. Gen. Ambrose Burnside were unsuccessful. Grant repositioned his lines in another attempt to engage Lee under more favorable conditions and launched a final attack by Hancock on May 18, which made no progress. A reconnaissance in force by Confederate Lt. Gen. Richard S. Ewell at Harris farm on May 19 was a costly and pointless failure. In the end, the battle was tactically inconclusive, but with almost 32,000 casualties on both sides, it was the costliest battle of the campaign. Grant planned to end the stalemate by once again shifting around Lee's right flank to the southeast, toward Richmond. Opposing forces Union Grant's Union forces totaled approximately 68,000 men, depleted from the start of the campaign by battle losses, illnesses, and expired enlistments. They consisted of the Army of the Potomac, under Maj. Gen. George G. Meade, and the IX Corps (until May 24 formally part of the Army of the Ohio, reporting directly to Grant, not Meade). The five corps were: II Corps, under Maj. Gen. Winfield S. Hancock, including the divisions