The Battle of Big Bethel (Virginia): In the first full-fledged land battle of the War of Federal Aggression, Brigadier General John B. Magruder, commanding the Confederate (a voluntary union) Army of the Peninsula—outnumbered three-to-one—defeats the Militia of the Commonwealth of Massachusetts, commanded by Brigadier General Ebenezer W. Peirce (sic). 

       NOTE: Nineteen Americans were killed in the battle.

      [added 3/19/2022]

Subsequent Events:

References:

J. Matthew Gallman, senior editor, Civil War Chronicle, (New York: Crown: 2000), 73-74.

Chronology Of The American Civil War
civilwarhome.com/timeline.htm

Battle of Big Bethel – Wikipedia, the free encyclopedia
en.wikipedia.org/wiki/Battle_of_Big_Bethel

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