Statistics for occurrence #1 of “Gen. Armistead T. Mason” in entry bladensburg-duelling-field of Harper's Encyclopedia of United States History:

...nsign Edward Hopkins, of the army, whose parents resided at Bladensburg, was shot on this field within sight of his home. Feb. 6, 1819, a most painful and desperate encounter occurred there between Gen. Armistead T. Mason and Col. John M. McCarty, who were cousins, and both of Virginia. Mason was at the time a United States Senator. The two gentlemen had quarrelled at an election, and McCarty was the challenger. ...
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