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|Battle of Les Formigues|
|Part of the Aragonese Crusade|
Kingdom of Sicily|
Crown of Aragon
Republic of Genoa
|Commanders and leaders|
Roger of Lauria|
Guilhem de Lodeva|
Henry di Mari
John de Orreo
|Casualties and losses|
|Unknown||15–20 or more galleys sunk, burnt, or captured|
The naval Battle of Les Formigues (Catalan) took place probably in the early morning of 4 September 1285 near Les Formigues Islands, Catalonia, about 85 km northeast of Barcelona, when a Catalan-Sicilian galley fleet commanded by Roger of Lauria defeated a French and Genoese galley fleet commanded by Guilhem de Lodeva, Henry di Mari, and John de Orrea.
There are three almost completely different accounts of this battle: from Ramon Muntaner, Bernard Desclot, and the Gesta comitum Barchinonensium. The Gesta places the battle at Les Formigues (or Fomigas), while Muntaner favoured a location off Roses to the north. Either Lauria or the French were ashore for the night and encountered by the other, or they were both at sea when the encounter took place.
The accounts agree that it happened at night, which was unusual for medieval naval battles, but suited Lauria who was skilled at night-fighting. He used two lanterns on each galley to increase his apparent numbers. Ten to sixteen Genoese galleys under John de Orreo fled, leaving about fifteen to twenty French galleys to be captured, and some others sunk or burnt.
The troubadour Joan Esteve blamed treachery for the capture of the French admiral Guilhem. It is said that three hundred French prisoners were sent back to France. All of the prisoners but one had their eyes gouged out, and that one was left with one eye to guide the others. The prisoners brought one message from Roger of Lauria to the King of France: that not even fish would be able to navigate safely through Mediterranean Sea without a shield or sign of the king of Aragon on them.