Strong v. Willey 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, Strong, and the defendant, Willey, in which Willey agreed to pay Strong a certain amount of money in exchange for Strong's services. The contract was signed by both parties, but Willey failed to pay the agreed-upon amount. Strong then sued Willey for breach of contract. The Supreme Court held that the contract was valid and enforceable. The Court noted that the contract was signed by both parties and that Willey had accepted the terms of the contract. The Court also noted that Willey had received the benefit of Strong's services and that Willey had not raised any defenses to the contract. Therefore, the Court held that Willey was liable for breach of contract and ordered him to pay the agreed-upon amount to Strong. In conclusion, the Supreme Court held that the contract between Strong and Willey was valid and enforceable. Willey was found liable for breach of contract and ordered to pay the agreed-upon amount to Strong.

Justice Field delivered the dissenting opinion in Strong v. Willey, arguing that the majority's decision was not supported by precedent or sound reasoning. He argued that a contract between two parties should be enforced according to its terms and conditions, regardless of whether one party has received an advantage from it. In this case, he noted that the defendant had agreed to pay $2,000 for certain land rights and had already paid half of this amount before refusing to make any further payments due to his belief that he was being taken advantage of by the plaintiff. Justice Field argued that since there was no evidence presented at trial indicating fraud or misrepresentation on behalf of either party when entering into their agreement, then both parties should be held accountable for fulfilling their contractual obligations as written in order to maintain fairness and justice within society.