1961年9月18日，联合国秘书长DAG Hammarskjold在罗得岛北部的一架飞机失事中丧生（现在赞比亚）。 他在刚果中飞往谈判停火。 Hammarskjold是前瑞典总理的儿子。1953年，他当选为联合国高级职位，并于1957年成功连任。 在他的第二个任期期间，他在比利时刚果发起并指导了联合国在比利时刚果的蓬勃作用。哈马克克里斯派遣了一个爱尔兰外交官的Conor O’Brien（1919-2008）到了刚果的刚果，在那里，叛乱公开支持比利时 秘密到法国秘密。奥布莱恩在联合国部队命令，但是在联合国组织的任务结束，联合国拒绝了任务。奥布莱恩将他的书籍中的事件版本“到Katanga和Back”叙述（1962年）。
原文：1961 Sep 18, Dag Hammarskjold, Secretary-General of the UN, was killed in a plane crash in Northern Rhodesia (now Zambia). He was flying to negotiate a cease-fire in the Congo. Hammarskjold was the son of a former Swedish prime minister. In 1953, he was elected to the top UN post and in 1957 was reelected. During his second term, he initiated and directed the United Nation”s vigorous role in the Belgian Congo. Hammarskjold had sent Conor O’Brien (1919-2008), an Irish diplomat, to the Congo where a rebellion was openly being backed by Belgium and secretly by Britain and France. O’Brien ordered in UN troops, but the mission ended in disarray and the UN repudiated the mission. O’Brien recounted his version of the events in his book “To Katanga and Back” (1962).