Peter the Hermit was sent to Kerbogha to suggest settling the conflict with a duel, but Kerbogha declined. A different Peter, Peter Bartholomew, whose "visions" led to the "buried" "Lance," joined the fight against the Muslims. Unknown to the Crusaders, Kerbogha's army had some internal conflicts and was not as powerful as it appeared. His superiors decided to teach the arrogant Kerbogha a lesson by not sending reinforcements. Kerbogha was forced to retreat to Mosul.
Inside Antioch afterward, the issue of the Holy Lance was re-examined, even though some attributed their military victory to its presence. Peter Bartholomew's vision of the Lance suggested it was buried just below the surface, but teams of men dug far down without success, until Peter went alone into the hole and "found" the lance point sticking up from the ground. Even though Peter's vision predicted a win against the Muslims, there were those who questioned Peter's truthfulness. One was papal legate Adhemar of Le Puy, who may have already been aware that a piece of the Lance was said to be in Constantinople.
Then, Adhemar died from plague on 1 August 1098, and Peter put himself forward as the spiritual leader on the Crusade. Peter actually claimed that Adhemar appeared to him in a vision and said he had suffered in Hell for three days because he had doubted the discovery of the Lance.
Peter claimed that Christ told him the Crusaders must march barefoot to Jerusalem, and other visions from Jesus and St. Andrew expressed anger at the sins of the Crusaders. When his further visions were ignored, and the veracity of the Lance was questioned, Peter volunteered to submit to a Trial by Ordeal to prove his innocence.
As a result, he went through trial by fire on 8 April 1099, which was Good Friday*. Peter would walk through a fire. Two piles of dry olive branches were made, four feet high and 13 feet long, with a one-foot space between them for Peter to walk through. Peter came to the trial wearing a simple tunic and prepared to walk through, carrying the Lance. If both appeared unharmed after the ordeal, he would be vindicated.
..and I will leave you there until tomorrow.
*Coincidentally this post has been made on Good Friday in 2024.