Admiralty in the 16th century has organized the fleet into squadrons from at early 13th century and certainly during the 16th century. In 1560 three squadrons were operating in the Channel, Irish Sea and North Sea Until the 16th century, admirals were high officials under kings, and were charged with protecting the realm from sea attack. The English navy's Narrow Seas Squadron also called as the Eastern Squadron mainly operated in the two seas which laying between England and Kingdom of France (the English Channel particularly the Straits of Dover) and England and the Spanish Netherlands later the Dutch Republic (the southern North Sea). Include:
St. Bartholomew's Day massacre response to the threatening atmosphere for Huguenots in these cities. In Rouen, where some hundreds were killed, the Huguenot community shrank from 16,500 to fewer than 3,000 mainly as a result of conversions and emigration to safer cities or countries. Some cities unaffected by the violence nevertheless witnessed a sharp decline in their Huguenot population. It has been claimed that the Huguenot community represented as much as 10% of the French population on the eve of the St. Bartholomew's Day massacre, declining to 7-8% by the end of the 16th century, and further after heavy persecution began once again during