At least 57 members of the so-called al-Shabaab group have died in one of the deadliest assaults on the al-Qaeda-linked group by the joint forces.
The extremists were killed on Thursday as the African Union and Somali forces attacked one of the groups camp.
According to the multinational force, vehicles and equipment were destroyed in the morning assault on the al-Shabaab camp outside Afmadhow and a large cache of weapons was recovered.
Al-Shabaab has lost ground in Somalia in recent years under pressure from such assaults but continues to carry out deadly attacks in the capital, Mogadishu.
And the expected withdrawal of the AU force by the end of 2020 has caused concern, as the burden of fighting al-Shabaab would fall on national forces that observers say are not yet ready.