In Williamsport Bank v. Knapp, the Supreme Court of the United States was asked to decide whether a bank could recover a debt from a third party who had received money from the debtor. The case involved a dispute between the Williamsport Bank and Knapp, a third party who had received money from the debtor. The bank had loaned money to the debtor, and the debtor had used the money to pay Knapp. The bank argued that it was entitled to recover the money from Knapp, as the money had been paid to him by the debtor. The Supreme Court held that the bank was not entitled to recover the money from Knapp. The Court reasoned that the bank had not taken any action to protect its rights against the debtor, and that the bank had not taken any steps to prevent the debtor from using the money to pay Knapp. The Court also noted that the bank had not taken any steps to secure the debt from the debtor, and that the bank had not taken any steps to protect its rights against Knapp. The Court concluded that the bank was not entitled to recover the money from Knapp.

Justice Field delivered the dissenting opinion in Williamsport Bank v. Knapp, arguing that the majority's decision was wrongfully decided and should be reversed. He argued that a bank has no right to set off an account against a debt due from another person unless it is authorized by law or contract between them. In this case, there was neither of these present; therefore, he believed the lower court's ruling should have been affirmed instead of being overturned by the Supreme Court. Justice Field further noted that if banks were allowed to do so without any legal authority then they would become creditors with special privileges over other creditors who must resort to legal remedies for collection of their debts while banks could simply take whatever money they wanted out of accounts held at their institution regardless if it belonged to someone else or not. This would create an unfair advantage and lead to potential abuse which is why he felt strongly about upholding the lower court’s ruling in favor of Knapp rather than allowing Williamsport Bank’s claim against him stand as valid under current laws and regulations governing such matters.