Answer :
Union forces never attacked richmond during the peninsula campaign because union generals decided that capturing richmond was no longer an important goal.
In the spring and summer of 1862, during the American Civil War, Major General George B. McClellan conducted a significant Union offensive against Richmond, the Confederate capital. McClellan planned an advance toward Richmond via the peninsula created by the York and James Rivers after transporting his Army of the Potomac by boat to Fort Monroe on the Atlantic coast in late April. The Union general waited until late May before taking action since he had a tendency of repeatedly underestimating his enemy's numbers.
Confederate General Joseph Johnston was hurt and Robert E. Lee took over during the unproductive Battle of Seven Pines, which marked the end of the first phase of the Peninsula Campaign.
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