The International Criminal Court has ordered a senior Ugandan commander in Joseph Kony's militia to stand trial on 70 charges including murder, rape, torture and using child soldiers.
Dominic Ongwen is the only member of Kony's Lord's Resistance Army in the court's custody.
Kony remains free despite years of efforts in northern Uganda and neighbouring countries to track down and capture him.
Judges said on Wednesday that evidence gathered by prosecutors is strong enough to merit a trial.
They based the decision on written and oral statements of 130 witnesses and intercepted radio communications.
The crimes allegedly happened before, during and after attacks on camps for internally displaced people in northern Uganda between 2003 and 2004.
No trial date was immediately set. Ongwen has not entered pleas to the charges.