What is Douglass’s job on Mr. Covey’s farm?

Mr. Covey gives Frederick Douglass a job that Douglass has never done before. For the first time in his entire life, Frederick Douglass is made into a field hand. He must work outside of the house and do backbreaking manual labor with all of the other field slaves. One of his first specific jobs that he is given is to hitch up a cart to some unbroken oxen and return from the forest with a load of wood. Douglass has no idea what he is doing, and the oxen end up becoming uncontrollable. The cart of wood tips, and Douglass ends up using much of the day trying to accomplish his single task. Needless to say, Covey isn't happy, and he beats Douglass until wearing out his switches. This kind of merciless beating happens to Douglass throughout the chapter.

Upon this he rushed at me with the fierceness of a tiger, tore off my clothes, and lashed me till he had worn out his switches, cutting me so savagely as to leave the marks visible for a long time after. This whipping was the first of a number just like it, and for similar offences.