In 1269, the English Prince Edward (the future Edward I), inspired by tales of his great-uncle, Richard the Lionheart, and the second crusade of the French King Louis, started on a crusade of his own, the Ninth Crusade. The number of knights and retainers that accompanied Edward on the crusade was quite small, possibly around 230 knights, with a total complement of approximately 1,000 people, transported in a flotilla of 13 ships. Edward understood the value of an alliance with the Mongols, and upon his arrival in Acre on , he immediately sent an embassy to the Mongol ruler Abaqa, requesting assistance. Abaqa answered positively to Edward's request, asking him to coordinate his activities with his general Samagar, whom he sent on an offensive against the Mamluks with 10,000 Mongols to join Edward's army. But Edward was able only to engage in some fairly ineffectual raids that did not actually achieve success in gaining new territory. For example, when he engaged in a raid into the Plain of Sharon, he proved unable to even take the small Mamluk fortress of Qaqun. However, Edward's military operations, limited though they were, were still of assistance in persuading the Mamluk leader Baibars to agree to a 10-year truce between the city of Acre and the Mamluks, signed in 1272. Edward's efforts were described by historian Reuven Amitai as "the nearest thing to real Mongol-Frankish military coordination that was ever to be achieved, by Edward or any other Frankish leader."