BY speaks a different, unknown language to oxen.
Wilford Woodruff, Journal, August 3, 1844 in Manuscript History of the Church, The Joseph Smith Papers website, accessed July 27. 2021
The Twelve continued their journey through the day and night by stage. While upon the journey they overtook a company of Norwegians who were travelling with ox teams, and heavily loaded wagons one of which was stuck fast in the mud, blocking up the road, while several of them were whipping the oxen and bawling to them in the Norwegian language, which seemed to frighten the oxen, but they were unable to move the wagons on. After sitting and looking at them a moment Prest [Brigham] Young got out of the coach and stepped up and took the whip out of the hands of one of the Norwegians, telling them all to stand out of the way. He then talked to the oxen in a tongue which was not understood by Norwegians or English, and touching them lightly with the whip, they instantly pulled the wagon out of the mud and continued the journey, much to the astonishment of the Norwegians, and the surprize and amusement of the passengers on the stage.