During which battle was Confederate General Robert S. Garnett killed?

The correct answer is the Battle of Carrick's Ford. During this battle, which took place on July 13, 1861, Confederate General Robert S. Garnett was killed, making him the first general officer to die in the Civil War. The battle was significant as it marked an early conflict in the war and underscored the difficulties the Confederate forces faced in those early months.

The other battles listed did not involve Garnett directly in his capacity as a Confederate general. The Battle of Antietam, for example, occurred in September 1862 and is known for being one of the bloodiest single-day battles in American history, but it had no connection to Garnett's death. Similarly, the Battle of Gettysburg, which took place in July 1863, involved numerous prominent generals but did not feature Garnett as a participant. Lastly, the First Battle of Bull Run, fought in July 1861, was another significant early battle but occurred several days before Garnett's death and thus did not involve his demise.