Çalışmalarına, muhtemelen I. Baudouin'i de içeren seyahat arkadaşlarının çağrılmasıyla başladı. Kudüs'te Haçlı seferinin mektuplarına ve diğer belgelerine erişebildiği en az bir kütüphane vardı. Bu kütüphanede, Foucher'in kişisel olarak tanık olmadığı özel bilgilerin çoğunun kaynağı olarak hizmet veren [[Raymond d'Aguilers]]'in ''Historia Francorum'' ve ''[[Gesta Francorum]]'' mevcut olmalıdır.
Fulcher divided his chronicle into three books. Book I described the preparations for the First Crusade in Clermont in 1095 up to the conquest of Jerusalem and the establishment of the [[Kingdom of Jerusalem]] by [[Godfrey of Bouillon]]. It included an enthusiastic description of [[Constantinople]]. The second book described the deeds of Baldwin I, who succeeded Godfrey and was [[king of Jerusalem]] from 1100 to 1118. The third and final book reported on the life of king [[Baldwin II of Jerusalem|Baldwin II]], until 1127 when there was a [[pandemic|plague]] in Jerusalem, during which Fulcher apparently died. The second and third books were written from around 1109 to 1115, and from 1118 to 1127, compiled into a second edition by Fulcher himself.
Fulcher's work was used by many other chroniclers who lived after him. [[William of Tyre]] and [[William of Malmesbury]] used part of the chronicle as a source. His chronicle is generally accurate, though not entirely so. It was published in the ''[[Recueil des historiens des croisades]]'' and the [[Patrologia Latina]], and a critical edition of the Latin version was published by Heinrich Hagenmeyer in 1913.