An innocent third party who purchases immovable property at a public auction conducted by the Deputy Sheriff, who pays the purchase price and receives transfer of title, is entitled to legal protection and cannot be divested of that property merely because the judgment debtor later challenges the underlying judgment or execution process. After a sale in execution has been confirmed and transfer effected to an innocent purchaser, the sale can only be impeached on grounds of bad faith, knowledge of prior irregularities in the sale, or fraud - not on grounds of alleged violations of court rules or general grounds of review. To resist summary judgment, a respondent must establish facts that, if proved, would constitute a valid defence - vague generalizations and bald assertions without material facts are insufficient.