One of
Omar Finish handed over six vehicles mounted with anti-aircraft guns and some 80 fighters. He becomes the third warlord to lay down his arms this week.
The warlords agreed to disarm last week - but as they did so, their gunmen battled in the capital,
Meanwhile, the African Union is meeting to discuss a peacekeeping force.
Ethiopian troops helped the government oust Islamist forces from the capital and much of southern
The 6,000-strong government forces are not seen as being capable of controlling the lawless country on their own - although it is being strengthened by the warlords.
On Wednesday, Mohamed Qanyare Afrah and Musa Sudi Yalahow handed over their weapons, as they had agreed to after meeting President Abdullahi Yusuf last week.
They surrendered control of about 300 men and 60 battle wagons between them.
Four other warlords said their militias would disarm but they have not yet done so.
The former militiamen will now go to a military camp for training.
Their clan-based militias have battled for control of parts of
The militias were hated by many Somalis for running road-blocks, where they extorted money.
Power vacuum
On Thursday, UN envoy to Somalia Francois Fall urged the country not to waste "the best opportunity for peace for 16 years" after visiting interim President Abdullahi Yusuf in
Mr Yusuf arrived in
The leaders of
So far only
Both
He says that if the Ethiopian forces withdraw before peacekeepers arrive, that could result in a dangerous power vacuum.
Photo caption
Soldiers guard surrendered battle-wagons