Identify the Turning Point Battle of the Civil War

During the Civil War, various battles and events significantly impacted the course of the conflict between the Union and the Confederacy. One pivotal battle, which marked a turning point in the war and galvanized support for the Union cause, was fought in July 1863. This battle not only resulted in a significant defeat for the Confederate army but also is often cited as the beginning of the decline of Confederate fortunes in the war. Can you identify this crucial battle?