How did Henry V gain naval control of the English Channel?

To gain naval control of the English Channel, Henry V focused on building a powerful fleet after his victory at the Battle of Agincourt in 1415.1

His strategy involved two key components:
* Diplomatic efforts: Henry utilized his diplomatic influence to detach Genoa from its naval alliance with France, thereby depriving the French of crucial maritime assistance.2
* Fleet development: He spent the year following Agincourt constructing a formidable navy specifically to clear the English Channel of Genoese ships that were supporting the French.1

These actions demonstrated an awareness of the importance of sea power that was unusual for medieval monarchs. Following the Battle of the Seine in August 1416, England’s naval mastery of the Channel was not seriously disputed.2