How did Bob Marley stop the war between the two rivals in Jamaica?

Bob Marley held "one love one piece" concert in Kingston, Jamaica on April 22, 1978. Both rivals were attending. At the end of the concert Bob marley asked prime minister Michael Manley and opposition leader Edward Seaga for coming to the stage in order to shake hands. After they ascended the stage, Bob Marley, Michael Manley and Edward Seaga shook hands togather in front of people. That day, the war was stopped, however it was renewed soon. On May 11, 1981 Bob Marley died of cancer. At his funeral two rivals met each other and shook their hands again. That day was the end of the civil war in Jamaica.