Historically, the name Mandera has been attributed to Madeer, the umbilical cord of animals, more specifically camels and goats. Nomadic pastoralists who roamed these region had been closing up near the River Daua to water their animals and many animals reproduced during these times.Among the notable incident of Mandera history was the The Rhamu Incident of the 1977 in which Somalia Military Invaded Ethiopia defences from the Kenyan side. Some 1500 Somali soldiers attacked a border post and killed 30 Kenyan police officers and soldiers. Because Mandera is inhabited by Somalis, who resemble those of Somalia and Ethiopia, the Somalia army successfully crossed into the Sidamo Region of Ethiopia in the so called Ogaden War..