Following the 1966 Nigerian coup d'état and the subsequent 1966 Nigerian counter-coup, a wave of resentment and hostility against Igbos because of their involvement in the former coup culminated in the 1966 anti-Igbo pogrom in which 30,000 Igbos and easterners have been estimated to have been killed. Following the erosion of military discipline and trust caused by the killings, a new regional military structure was formed with Military districts in the four regions (Northern, Western, Mid-Western, and Eastern) of the country. However, this raised problems as the ethnic structure of the Mid-Western military was heavily lopsided towards the Midwestern Igbos, who not only made up a sizable portion of troops, but over 75% of the 42 Mid-western officers were Igbo. In an attempt to prevent abuse of power, Ejoor refused to allow a group consisting of Yon DaKolo and Lt. Col. Mike Okwechime from importing weapons, instead choosing to ask the federal government for weapons directly, of which they sent a small amount of Mark V rifles for the 300 soldiers in the area. This, along with the lack of effort to raise any new troops left the Mid-Western region in an incapacitated state by the time the Biafrans invaded in 1967.