What does Coggs v Bernard establish? (case circumstances)

The plaintiff, Coggs, claimed that Bernard agreed to collect several hogsheads of brandy from a cellar and transfer them to a cellar in Water Lane in the City of London. Bernard carried out this task but he or his servants or agents were negligent and staved-in one of the casks at the delivery address, causing a large quantity of brandy to be lost. the court found for the plaintiff stating that they were negligent in their storing abilities