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Peninsula campaign

BelligerentsUnited StatesConfederate States of AmericaCommanders and leadersGeorge B. McClellanJoseph E. JohnstonGustavus Woodson SmithRobert E. LeeJohn B. MagruderUnits involvedArmy of the PotomacArmy of Northern VirginiaStrength102,236 (May 20);105,857 (June 20);88,445 (July 10)94,813 (May 31)112,220 (June 26)74,065 (July 20)Casualties and losses 23,119 29,298The Peninsula campaign (also known as the Peninsular campaign) of the American Civil War was a major Union operation launched in southeastern Virginia from March to July 1862, the first large-scale offensive in the Eastern Theater.

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