By late 1965, Egyptian President Gamel Abdel Nasser had sent 70,000 troops in Yemen to support a republican coup against royalist forces. Despite using prohibited chemical weapons against Yemeni guerillas from 1963 to 1967 – a first in an intra-Arab conflict – Egypt failed to achieve its objectives.
20世纪60年代埃及军事干预也门就是一个很好的例子。到1965年末，埃及总统纳赛尔派遣70，000部队到也门支持反对皇家军队的共和党政变。尽管从1963到1967年对也门游击队使用了违禁的化学武器——这是阿拉伯内部冲突中首次使用化学武器——埃及依然未能达到自己的目的。