By and large, the new operations were successful. In El Salvador and Mozambique, for example, peacekeeping provided ways to achieve self-sustaining peace. Some efforts failed, perhaps as the result of an overly optimistic assessment of what UN peacekeeping could accomplish. While complex missions in Cambodia and Mozambique were ongoing, the Security Council dispatched peacekeepers to conflict zones like Somalia, where neither ceasefires nor the consent of all the parties in conflict had been secured. These operations did not have the manpower, nor were they supported by the required political will, to implement their mandates. The failures—most notably the 1994 Rwandan genocide and the 1995 massacre in Srebrenica and Bosnia and Herzegovina—led to a period of retrenchment and self-examination in UN peacekeeping. As a result, relatively small UNTAES transitional administration in Eastern Slavonia received high level of commitments and was turned into “"proving ground for ideas, methods, and procedures"”. It turned out to be labeled as the most successful UN missions and was followed by other more ambitious transitional administrations in Kosovo (UNMIK) and East Timor (UNTAET).