How did Douglass come to work for mr. Covey

Master Thomas sent Douglass to Covey in order to break him.

Master Thomas at length said he would stand it no longer. I had lived with him nine months, during which time he had given me a number of severe whippings, all to no good purpose. He resolved to put me out, as he said, to be broken; and, for this purpose, he let me for one year to a man named Edward Covey. Mr. Covey was a poor man, a farm-renter. He rented the place upon which he lived, as also the hands with which he tilled it. Mr. Covey had acquired a very high reputation for breaking young slaves, and this reputation was of immense value to him.