After four days of probing attacks, Gen. Ulysses S. Grant ordered a frontal assault against the Confederate lines at Spotsylvania Court House on 12 May 1864. The focal point of the attack was the Muleshoe Salient, an outward bulge in the Confederate line. While the II and IV Corps struck the head of the salient, resulting in the struggle for the "Bloody Angle," Gen. Ambrose E. Burnside's IX Corps assaulted the Muleshoe's eastern face, known as Heth's Salient, located nearby. Confederate defenders, ensconced behind log works, repulsed the early morning attacks and at 2 p.m. counterattacked through this area. During more than 20 hours of fighting the Federals lost some 9,000 killed, wounded, and captured. The Confederates lost an estimated 8,000 casualties.