エリトリア解放戦線
In September 1966, Isaias left the university where he was studying and travelled to Kassala, Sudan, via Asmara to join the Eritrean Liberation Front (ELF). In 1967, the Chinese government donated light weapons and a small amount of cash to cover the cost of transport and provided training to ELF combatants. Isaias was among the first group that went to China in 1967 where he received intensive military training. Upon his return, he was appointed as a political commissioner of the ELF's Zone 5 in the Hamasen region.