Within months a call was made for an international women's conference to be held in The Hague. Coordinated by Mia Boissevain, Aletta Jacobs and Rosa Manus, the Congress, which opened on 28 April 1915 was attended by 1,136 participants from both neutral and non-belligerent nations, and resulted in the establishment of an organization which would become the Women's International League for Peace and Freedom (WILPF). At the close of the conference, two delegations of women were dispatched to meet European heads of state over the next several months. They secured agreement from reluctant Foreign Ministers, who overall felt that such a body would be ineffective, but agreed to participate or not impede creation of a neutral mediating body, if other nations agreed and if President Woodrow Wilson would initiate a body. In the midst of the War, Wilson refused.