A large and well-organized fleet under Louis IX sailed from Aigues-Mortes about a month late, on 1 July 1270. The following day a second fleet under the King of Navarre sailed from Marseille. The two fleets joined up at Cagliari on the southern coast of Sardinia. They landed on the Tunisian coast on 18 July without facing much resistance. The crusaders built a camp near a fort built over Carthage and awaited the arrival of the Sicilian contingent under Charles of Anjou. The North African summer bred pestilence, and an epidemic of dysentery swept through the crusading ranks. Louis' Damietta-born son John Tristan died of the disease on 3 August. Soon Louis, too, fell sick, and died, in penitence, on a bed of ashes on 25 August. His brother Charles arrived just after his death.