The apparition of Mary at Fatima scheduled for the 13th had been interrupted by the abduction of Jacinta, Francisco and Lucy by the local government officials. After two days of threats without the children revealing the secrets or recanting their story, they were released. On the afternoon of August 19th they were in the pastures of the Cova da Iria with their flock of sheep when Our Lady appeared to them again.
She once more promised a miracle on October 13th and added that St Joseph would appear “with the with the Child Jesus, to give peace to the world. Our Lord will come to bless the people. Our Lady of the Rosary and Our Lady of Sorrows will come also.” Our Lady said: “Pray, pray very much, and make sacrifices for sinners, for many souls go to Hell because they have no one to make sacrifices and pray for them.”
(Adapted from: http://www.fatima.org/essentials/facts/1917appar.asp)