The Greek Fire, still rejected among the nations of Western Europe, for the reasons assigned in a former page, was in frequent use among the Saracens. In 1250, the Christians, advancing towards Damietta by water, were intercepted by their enemies. "The Saracens in their vessels met the Christians sailing down the river, where a most fatal naval conflict ensued, the missiles of the combatants flying like hail. At length, after an obstinate battle, rendered more dreadful by the Greek fire hurled on them by the Saracens, the Christians, being worn out by grief and hunger, suffered a defeat[387]." The letter "to his respected lord, Richard, earl of Cornwall," from "John, his Chancellor," gives a similar account of this terrible fight; from which one only of the Christians escaped, "Alexander Giffard, an Englishman of noble blood." "The Saracens, by throwing Greek fire on the Christians, burnt many of their boats and killed the people in them, thus obtaining the victory. The Christians were drowned, slain, and burnt[388]." The authors of the treatise, _Du feu grégeois_, Captain Favé and M. Reinaud, remark that during the fifty-seven years of the reign of French princes at Constantinople (taken in 1204), the secret of the Greek fire could not have remained concealed from men who had made some advances in the science of chymistry. "Mais alors les préjugés de l'ignorance se joignaient aux idées religieuses et aux sentimens chevaleresques, pour repousser l'emploi d'un art qui semblait rendre inutiles la force et le courage individuels[389]."