Eleanor and her female retinue traveled separately from Louis and the main part of the army. Louis had taken a vow of chastity for the duration of the Crusade, and did not want to be tempted by the proximity of his young wife. In January of 1148, Louis sent a part of the army with Eleanor to go ahead and establish a camp at a certain spot, while he and the bulk of the army made their way to it. Arriving at the king's choice, Eleanor decided she did not like it, and persuaded or ordered the leaders to move to a place more suitable.
When the king and the main army arrived, they found nothing prepared, and in the growing darkness could not find the new location. The army was now divided, and an easier target for the Turks whose land they were traversing. The main force was attacked. Louis survived, although his horse was killed while he was riding it. In all, 7000 Crusaders were killed. Eleanor was blamed for the slaughter.
The remainder of the army went to the coast, looking for ships to continue to the Holy Land. They ran out of supplies, and turned to the horses for food. They did not have money for enough ships to continue their quest. Illness swept through the camp.
Louis took Eleanor and his nobles and got on a ship bound for Antioch, abandoning the army. It was written that 3000 soldiers converted to Islam in order to save their lives.
Antioch at the time was ruled by Eleanor's uncle, Raymond of Poitiers. Raymond wanted Louis to stay in Antioch and help him in the conquest of Aleppo and Caesarea, but Louis (despite Eleanor's protests) would not take his eye off Jerusalem. Louis with his remaining men left Antioch abruptly, meeting up with Conrad III of Germany again. Along with King Baldwin III of Jerusalem, they lay siege to Damascus, which was an utter failure.
Eleanor pushed for a return to Antioch to help her uncle, but the Crusade was finished, and so Louis returned to France. Raymond of Poitiers died later that year. The relationship between Louis and Eleanor was strained. Perhaps if Eleanor had produced a male heir, Louis would have been content with letting her live in her own castle somewhere, but he needed a wife who would beget a son, and he was no longer looking at Eleanor as a path to that.
He needed to get rid of her. I'll explain how tomorrow.
