After the 1956 campaign in which Israel conquered Sharm el-Sheikh and opened the blocked Straits, it was forced to withdraw and return the territory to Egypt. At the time, members of the international community pledged that Israel would never again be denied use of the Straits of Tiran. The French representative to the UN, for example, announced that an attempt to interfere with free shipping in the Straits would be against international law, and American President Dwight Eisenhower went so far as publicly to recognize that reimposing a blockade in the Straits of Tiran would be seen as an aggressive act which would oblige Israel to protect its maritime rights in accordance with Article 51 of the UN Charter.