During the Siege of Antioch in 1098 (pictured here: Kerbogha outside the city) he was ordained and made chaplain to Count Raymond IV of Toulouse. From his extensive Historia Francorum qui ceperunt Iherusalem ("History of the Franks who captured Jerusalem"), we learn a lot of what went on among those leading the Crusade, since he was positioned to be close to their discussions.
He was also close to the lesser population of the Crusade: he says he spent seven months sharing the sleeping quarters of Peter Bartholomew, whose story of visions and finding the Holy Lance that was used to pierce Jesus' side during the Crucifixion is told in Parts One, Two, and Three. Raymond was a firm supporter of Peter's sincerity, but even Raymond noticed that there were discrepancies between Peter's visions and the actual finding of the Lance.
Since it does not mention the demise of Raymond's patron, Count Raymond of Toulouse (28 February 1105), it is likely the Historia was probably written during the Crusade and completed shortly after, and so can be counted on as an accurate memory of events. On that score, however, we must always apply critical thinking: what motives would the medieval historian have for writing? It would be unusual to find a medieval historian who recorded events objectively. There was always an agenda to follow, such as the goodness of a patron or the holiness of an individual who deserved sainthood. Raymond is always careful to record that his observations had witnesses other than himself; however, those witnesses are often anonymous. There is circumstantial evidence that it was completed in 1101, or that at least parts were in circulation, because it is certainly a source used by Fulcher of Chartres for his history.
Raymond's original "boss," Bishop Adhemar of Le Puy, died along the way, but there's an anecdote shared by Raymond about him being "mugged." It shows how both those marching on Crusade and those whose lands were being marched through were exposed to danger. Have a Happy Easter, and I'll see you here tomorrow.