But at the end they lost the war,the same happened to Germany,it defeated France and many other countries in WWII but at the end Germany was defeated by EE.UU and URSS.
Look at this source it belongs to David Laitin.
"The particular brutality, corruption, and increasingly narrow base of Siyaad's regime, which held on to power for over a decade after a devastating military defeat (in 1978) in Ethiopia"
http://www.ciaonet.org/conf/iwp01/iwp01ad.html