At the same meeting, the Security Council adopted Resolution 143 (1960), by which it called upon the Government of Belgium to withdraw its troops from the territory of the Congo. The resolution authorized the Secretary-General to facilitate the withdrawal of Belgian troops, maintain law and order, and help to establish and legitimize the post-colonial government. This mission was approved by a Security Council vote eight in favor and none against, with three countries abstaining. Both the United States and Soviet Union voted in favor. This mandate was extended to maintain the territorial integrity of the Congo, particularly through the removal of the foreign mercenaries supporting the secession of Katanga. ONUC's intention was an unprecedented role for a UN peacekeeping force, as it was not self-evidently peacekeeping in nature.