From its small beginning and official launch in 1992, Williams and the ICBL dramatically achieved the campaign's goal of an international treaty banning antipersonnel landmines during a diplomatic conference held in Oslo in September 1997. The Ottawa Treaty that banned land-mines is credited to her and the ICBL. Three weeks later, she and the ICBL were awarded the Nobel Peace Prize. At that time, she became the tenth woman – and third American woman – in its almost hundred-year history to receive the Prize.