Abdel Hakim Amer from Egypt and Abdullah al-Sallal from the Yemen Arab Republic. During the conflict over 50,000 of Egypt's troops were tied down in Yemen, which proved to be a disadvantage to Egypt during the 1967 Six-Day War with Israel. Egyptian troops were withdrawn to join the Six-Day War. The civil war concluded when the Republican forces won, and resulting in the transformation of the Mutawakkilite Kingdom of Yemen into the Yemen Arab Republic. Over 100,000 died on both sides during the conflict. Chemical warfare during North Yemen Civil War The first attack took place on June 8, 1963 against Kawma, a village of about 100 inhabitants in northern Yemen, killing about seven people and damaging the eyes and lungs of twenty-five others. This incident is considered to have been experimental, and the bombs were described as "home-made, amateurish and relatively ineffective". The Egyptian authorities suggested that the reported incidents were probably caused by napalm, not gas. The Israeli Foreign Minister, Golda Meir, suggested in an interview that Nasser would not hesitate to use gas against Israel as well. There were no reports of gas during 1964, and only a few were reported in 1965. The reports grew more frequent in late 1966. On December 11, 1966, fifteen gas bombs killed two people and injured thirty-five. On January 5, 1967, the biggest gas attack came against the village of Kitaf, causing 270 casualties, including 140 fatalities. The target may have been Prince Hassan bin Yahya, who had installed his headquarters nearby. The Egyptian government denied using poison gas, and alleged that Britain and the US were using the reports as psychological warfare against Egypt. On February 12, 1967, it said it would welcome a UN investigation. On March 1, U Thant said he was "powerless" to deal with the matter. On May 10, the twin villages of Gahar and Gadafa in Wadi Hirran, where Prince Mohamed bin Mohsin was in command, were gas bombed, killing at least seventy-five. The Red Cross was alerted and on June 2, it issued a statement in Geneva expressing concern. The Institute of Forensic Medicine at the University of Berne made a statement, based on a Red Cross report, that the gas was likely to have been halogenous derivatives - phosgene, mustard gas, lewisite, chloride or cyanogen bromide. The gas attacks stopped for three weeks after the Six-Day War of June, but resumed on