In 1785,
Barbary pirates captured the American merchant ship
The Maria Boston, on its way to Cadiz carrying furs, lumber, and dried codfish. They took Cathcart and 20 other sailors as
slaves. During the 11 years of his slavery in
Algiers, Cathcart managed by means of good fortune, cleverness, and bribery to improve his circumstances, eventually becoming chief clerk to the
Dey. In that position, he acted as a mediator between the Dey and Joseph Donaldson Jr., an agent for Colonel
David Humphreys, the U.S. Minister to Portugal, which resulted in the
Treaty of Algiers of 1796 and allowed his freedom. Cathcart, for the first several years of his captivity, endured the same terrible living conditions as his fellow slaves. One of a few handpicked by the Dey, Cathcart's first duties were to work in the Dey's palace garden caring for the lions, tigers, and antelopes. Although his assigned duties were relatively light, his masters provided scant food and administered several beatings, called
bastinado; in one instance, Cathcart lost several of his toenails. As his fortunes and positions in
Algiers improved, Cathcart acquired additional skills that he used later as a diplomat. He found opportunities to demonstrate his concern for his fellow prisoners. During his slavery, he became conversant in Arabic and Turkish. When Cathcart became clerk of the prison, he was able to buy several taverns, a house with servants, and more food for his fellow crew members. After the Treaty of Algiers freed them, Cathcart had the means to purchase a ship, which he sailed to Philadelphia in 1796 with 12 surviving members of the original crew. == Personal==