page 109 of 960 of Sir Thomas Malory: Le Morte Darthur: The Definitive Original Text Edition

109:

Arthur agrees to fight for this evil Damas. It also turns out these lady’s are from Morgan le Fay, so you know they’re no good. All the knights are freed from the prison (20 total / thought it was 18 + Arthur?). Story switches to Accalon (was out hunting with Arthur) who woke up in a well and is rescued.