In June 1340 Edward III commanded the English fleet at the Battle of Sluys where the kings standard was flown at top of the main masthead this positioning of the only command flag used during that battle was later reserved for use by monarchs or his deputy commander the Lord Admiral. In 1495 Henry VII authorized the use of his standard during the expeditions of John Cabot. In 1530 Henry VIII instructed Sir Thomas Audley to create a set of instructions that made clear which command flags are to be flown onboard ships and by whom at this time a single command flag was to be used at the top of the masthead. Audley produced the book of instructions called the Book of Orders for the War by Sea and Land. Between 1545 and 1547 Lord Lisle under instructions from the King altered Audley's instructions this time to denote three squadron commanders as follows.