Richmond, Confederate cavalry commander Maj. Gen. J.E.B. Stuart was mortally wounded at the Battle of Yellow Tavern (May 11). In a raid attempting to destroy the Virginia Central Railroad to the west, Sheridan was thwarted by Maj. Gen. Wade Hampton at the Battle of Trevilian Station (June 11–12), the largest cavalry battle of the war. Background Military situation In March 1864, Grant was summoned from the Western Theater, promoted to lieutenant general, and given command of all Union armies. He chose to make his headquarters with the Army of the Potomac, although Meade retained formal command of that army. Maj. Gen. William Tecumseh Sherman succeeded Grant in command of most of the western armies. Grant and President Abraham Lincoln devised a coordinated strategy that would strike at the heart of the Confederacy from multiple directions: Grant, Meade, and Benjamin Butler against Lee near Richmond, Virginia; Franz Sigel in the Shenandoah Valley; Sherman to invade Georgia, defeat Joseph E. Johnston, and capture Atlanta; George Crook and William W. Averell to operate against railroad supply lines in West Virginia; and Nathaniel Banks to capture Mobile, Alabama. This was the first time the Union armies would have a coordinated offensive strategy across a number of theaters. Although previous Union campaigns in Virginia targeted the Confederate capital of Richmond as their primary objective, this time the goal was to capture Richmond by aiming for the destruction of Lee's army. Lincoln had long advocated this strategy for his generals, recognizing that the city would certainly fall after the loss of its principal defensive army. Grant ordered Meade, "Wherever Lee goes, there you will go also." Although he hoped for a quick, decisive battle, Grant was prepared to fight a war of attrition. He meant to "hammer continuously against the armed force of the enemy and his resources until by mere attrition, if in no other way, there should be nothing left to him but an equal submission with the loyal section of our common country to the constitution and laws of the land." Both Union and Confederate casualties could be high, but the Union had greater resources to replace lost soldiers and equipment. Opposing forces Despite Grant's superior numbers, he had manpower challenges. Following their severe beating at the Battle of Gettysburg the previous year, the I Corps and the III Corps had been disbanded and their survivors reallocated to other corps, which damaged unit