Battle of the Seine (1416)

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Battle of the Seine
Part of Hundred Years War
Date15 August 1416
Port of Harfluer, France
Result English Victory
Flag Kingdom of England 1188 to 1707.png English Navy Flag of the French Navy 1365 to 1643.gif French Navy
Flag of the Republic of Genoa 1005 to 1797.png Genoese Navy
Commanders and leaders
Arms of John of Lancaster, 1st Duke of Bedford.png John of Lancaster, 1st Duke of Bedford
Flag of the French Navy 1365 to 1643.gif Admiral Guillaume de Montenay
Arms of William II, Viscount of Narbonne.png Viscount of Narbonne, William II
250 and 300 ships of all sizes 150 French ships
8 Genoese Carracks
12 Genoese Galleys
Casualties and losses
Unknown Unknown

The Battle of the Seine also known as the Naval Battle of Harlfeur was not well-known and yet important naval engagement fought in the mouth of the river Seine, on 15 August 1416, which occurred between a large fleet of the English Navy under the command of the king Henry V’s brother John of Lancaster, 1st Duke of Bedford.[1] He successfully defeated and scattered a Franco-Genoese naval force under the command of Guillaume de Montenay and the Viscount of Narbonne, William II blockading the recently conquered port of Harfleur in France.[2]


  1. Friel, Ian (2015). Henry V's navy : the sea-road to Agincourt and conquest 1413-1422. Staplehurst, England.: Spellmount. p. 123. ISBN 9780750963923.
  2. Szarmach, Paul E.; Tavormina, M. Teresa; Rosenthal, Joel T. (2017). Routledge Revivals: Medieval England (1998): An Encyclopedia. London: Taylor & Francis. p. 117. ISBN 978-1-351-66637-4.