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He continued his association with regulars in the early defensive positions around Washington, D.C., and then as a division commander of regulars in the Peninsula Campaign, the 2nd Division of the V Corps.
In March 1862, Hatch assumed command of the cavalry of the V Corps under Major General Nathaniel P. Banks.
Bloomquist was killed by a bombing attack by the Red Army Faction on the Headquarters of the V Corps in the IG Farben Building in Frankfurt.
Meanwhile, inland of V Corps, Orsogna had suffered three successive assaults but XIII Corps spearheaded by 2nd New Zealand Division could not get past the defending 26th Panzer Division.
During the course of the war, V Corps was initially commanded by General Holland 'Howlin Mad' Smith and later by General Harry Schmidt.