Oliver Wendell Holmes, Jr., Allen v. United States (204 U.S. 581…
“ The United States, by way of counterclaim to this attempt to get additional pay, demanded the sums already paid to the claimant contrary to the principle that we have laid down, and the court of claims allowed an offset of $3,120, found to have been paid by mistake, against the larger sum that it found due to the claimant. We see no reason to doubt the right of the United States, or the legality of its asserting that right by counterclaim. ”
