Final answer:
The Union's unsuccessful attempt to seize Richmond was part of the Peninsula Campaign during the American Civil War.
Explanation:
The Union's failed attempt to capture the Confederate city of Richmond was known as the Peninsula Campaign. This campaign took place in 1862 during the American Civil War, and it was a series of battles fought in Virginia as part of Major General George B. McClellan's plan to capture Richmond and end the war.
The Seven Days Battles were a significant part of this campaign, where General Robert E. Lee forced the Union Army to retreat from Richmond.
Despite Union forces occupying a strong defensive position at Malvern Hill, Lee ordered an attack that resulted in heavy casualties for the Confederates but ultimately led to the Union retreat.
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