After the Capture of Port Harcourt Benjamin Adekunle started Operation OAU which was a draw for both sides but cost Nigeria 21,500 men.
In July 1968 the Nigerian General and commander of the 3rd Marine Division Benjamin Adekunle began making plans for an invasion of Aba, Owerri, and Umuahia in a military operation he nicknamed Operation OAU, Adekunle boldly stated that he would be able to capture all three cities in 2 weeks.
On June 28, 1968 Umuahia was captured by Nigerian troops during Operation OAU but was re-captured by Biafran troops on July 23 that same year.
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