Short answers, pulled from the story.
The Battle of Spotsylvania Court House was the second major battle of Lt. Gen. Ulysses S. Grant and Maj. Gen. George G. Meade's 1864 Overland Campaign against Confederate General Robert E. Lee. Fighting took place on and off from the 8th through the 21st of May 1864 in Spotsylvania County, Virginia, and ended tactically inconclusive with both sides claiming victory.
The Battle of Spotsylvania Court House was fought from the 8th of May through the 21st of May 1864. It followed directly after the Battle of the Wilderness, fought earlier that same month.
The Battle of Spotsylvania Court House produced almost 32,000 total casualties on both sides, making it the costliest battle of the Overland Campaign. Union losses topped 18,000, including close to 3,000 killed, while Lee's army lost another 10,000-13,000 men.
The Bloody Angle was the western edge of the Mule Shoe salient, where Union and Confederate troops fought nearly 24 hours of hand-to-hand combat on the 12th of May 1864. The fighting there was so intense that gunfire alone severed a 22-inch oak tree, a stump now held by the Smithsonian Institution.
Lt. Gen. Ulysses S. Grant and Maj. Gen. George G. Meade led the roughly 100,000-man Union army, while Confederate Gen. Robert E. Lee commanded about 52,000 men in the Army of Northern Virginia. Union corps commanders included Winfield S. Hancock, Gouverneur K. Warren, John Sedgwick, and Ambrose Burnside.
Maj. Gen. John Sedgwick was shot and killed by a Confederate sharpshooter on the 9th of May 1864 while inspecting his VI Corps line. He was the highest-ranking Union officer by seniority to die during the entire Civil War, and had just told his men, 'they couldn't hit an elephant at this distance.'