As political and economic changes affected Bristols trade with France after the loss of English territories in 1453, her merchants looked elsewhere for trading opportunities. French wine was replaced with Spanish sherry, a drink that became so closely linked to Bristol that it was called " Bristol Milk".
A hogshead is a large cask of liquid (or, less often, of a food commodity). More specifically, it refers to a specified volume, measured in either imperial or US customary measures, primarily applied to alcoholic beverages, such as wine, ale, or cider.
1 hogshead =