Given the following context:

In 1688, the Spanish sent three more expeditions, two by sea and one by land. The land expedition, led by Alonso De León, discovered Jean Gery, who had deserted the French colony and was living in Southern Texas with the Coahuiltecans. Using Gery as a translator and guide, De León finally found the French fort in late April 1689. The fort and the five crude houses surrounding it were in ruins. Several months before, the Karankawa had attacked the settlement. They destroyed the structures and left the bodies of three people, including a woman who had been shot in the back. A Spanish priest who had accompanied De León conducted funeral services for the three victims. The chronicler of the Spanish expedition, Juan Bautista Chapa, wrote that the devastation was God's punishment for opposing the Pope, as Pope Alexander VI had granted the Indies exclusively to the Spanish. The remains of the fort were destroyed by the Spanish, who also buried the French cannons left behind. The Spanish later built a fort on the same location.
In early 1689, Spanish authorities received a plea, written in French. Jumano scouts had received these papers from the Caddo, who asked that they be delivered to the Spanish. The papers included a parchment painting of a ship, as well as a written message from Jean L'Archevêque. The message read:
I do not know what sort of people you are. We are French[;] we are among the savages[;] we would like much to be Among the Christians such as we are[.] ... we are solely grieved to be among beasts like these who believe neither in God nor in anything. Gentlemen, if you are willing to take us away, you have only to send a message. ... We will deliver ourselves up to you.

answer the following question:

Whose message said they will deliver themselves up to you? 

Jean L'Archevêque