Nasser's regional position changed unexpectedly when Yemeni officers led by Nasser supporter Abdullah al-Sallal overthrew Imam Badr of North Yemen on 27 September 1962. Al-Badr and his tribal partisans began receiving increasing support from Saudi Arabia to help reinstate the kingdom, while Nasser subsequently accepted a request by Sallal to militarily aid the new government on 30 September. Consequently, Egypt became increasingly embroiled in the drawn-out civil war until it withdrew its forces in 1967. Most of Nasser's old colleagues had questioned the wisdom of continuing the war, but Amer reassured Nasser of their coming victory. Nasser later remarked in 1968 that intervention in Yemen was a "miscalculation".

What country experienced a coup in 1962?