Beauregard v. Case was a United States Supreme Court case that dealt with the issue of whether a contract between two parties was valid. The case involved a contract between the plaintiff, Beauregard, and the defendant, Case, in which Beauregard agreed to pay Case a certain sum of money in exchange for Case's promise to perform certain services. Beauregard argued that the contract was invalid because it was not in writing, while Case argued that the contract was valid because it had been orally agreed upon. The Supreme Court ultimately ruled in favor of Case, finding that the contract was valid and enforceable. The Court held that the contract was binding because it had been agreed upon by both parties, and that the lack of a written agreement did not invalidate the contract. The Court also noted that the parties had acted in reliance on the contract, and that Beauregard had received the benefit of Case's services. As such, the Court found that the contract was valid and enforceable.

Justice Field delivered the dissenting opinion in Beauregard v. Case, arguing that the majority had failed to properly consider and apply established legal principles when deciding the case. He argued that a contract between two parties should be enforced according to its terms unless there is some valid reason for not doing so, such as fraud or mistake. In this case, he noted that no such reasons were present; instead, it was simply a matter of one party changing their mind after entering into an agreement with another party. As such, Justice Field believed that the court should have enforced the contract as written and awarded damages to Beauregard for breach of contract by Case. Furthermore, he argued that even if there were some ambiguity in how certain parts of the contract could be interpreted or applied - which he did not believe was true - then it would still be up to a jury rather than judges on appeal to decide what those interpretations meant and how they affected any potential damages owed by either side. Ultimately, Justice Field concluded his dissent by stating his belief that enforcing contracts according to their terms is essential for maintaining fairness within society's commercial transactions and thus must always take precedence over other considerations whenever possible