The M23 rebels controlled local capital and advanced deeper to the east.
Hundreds of people died and hundreds of thousands were forced at home.
A few weeks of attacks by Rwanda, supported by the Eastern Democratic Republic of Congo, are in a regional crisis.
The United Nations was estimated to have been involved by 4,000 Rwanda soldiers last year.
Kinshasa says that on March 23, the M23 armed group wants control of this region, rich in minerals.
Rwanda said he refused to support the rebels and placed the army to prevent the battle from spreading into the territory.
Leaders in the southern and eastern Africa are trying to mediate both sides.
Will their efforts succeed?
presenter: James Bay
customer :
Nicodemus MINDE -East African Peace and Security Governance Research Institute, Security Research Institute
Crystal Orderson -Reporter, Africa Report
Yinka Adegoke -Semafor Africa Editor
