Smith v Hughes (1871) LR 6 QB 597 is an English contract law case. In it, Justice Blackburn set out his classic statement of the objective interpretation of people's conduct (acceptance by conduct) when entering into a contract. The case regarded a mistake made by Mr. Hughes, a horse trainer, who bought a quantity of oats that were the same as a sample he had been shown. However, Hughes had misidentified the kind of oats: his horse could not eat them, and he refused to pay for them. Smith, the oat supplier, sued for Hughes to complete the sale as agreed. The court sided with Smith, as he provided the oats Hughes agreed to buy. That Hughes made a mistake was his own fault, as he had not been misled by Smith. Since Smith had made no fault, there was no mutual mistake, and the sale contract was still valid.