Naval Battle of Formigues
Formigues Islands, Mediterranean Sea, off the coast of Catalonia · Aragon Crusade
On September 4, 1285, the Aragonese fleet of Roger de Lauria, admiral of Peter III of Aragon, inflicted a crushing defeat on the French fleet commanded by Jean de Grailly off the Formigues Islands, near the Catalan coast. The battle took place at night, exploiting the effect of surprise and the tactical superiority of the Aragonese sailors. The French fleet, made up of around 40 galleys, was surprised while cruising offshore to secure supplies for the French land army in Catalonia. Roger de Lauria, with around 30 galleys but seasoned crews, used encirclement and boarding tactics which caused panic in the French ranks. Several French ships were sunk or captured, and Jean de Grailly was taken prisoner. This naval defeat deprived the French army of its maritime supplies and directly contributed to the failure of the Aragon Crusade.