Ugandan troops sent this week into eastern Democratic Republic of Congo would stay as long as needed to defeat Islamist militants, said Uganda.
The progress of the mission is to be evaluated after two months.
Uganda and Congo launched a joint operation this week against the Allied Democratic Forces (ADF), an armed group aligned with Islamic State.
The ADF began as an uprising in Uganda but has been based in Congo since the late 1990s. It pledged allegiance to Islamic State in mid-2019.
Uganda blamed the ADF for a triple suicide bombing in its capital Kampala on November 16, which killed seven people, including the bombers.
Islamic State has claimed responsibility for some of the ADF’s violence, including the recent bombings in Uganda.
The Ugandan defence ministry did not confirm how many troops had been deployed so far or expected duration on Congolese soil. But said infantry, artillery, armoured and Special Forces would be in Congo under Operation Shujja, which means hero in Swahili.
“The duration of this operation will be determined by the military-strategic end-state… to defeat the rebels and defeat their will to fight,” Major General Kayanja Muhanga said in a video posted to Twitter.
The campaign will target four ADF camps: Yayuwa, Tondoli, Beni One and Beni Two, he said.
At least 1,700 Ugandan soldiers have so far crossed into eastern Congo to join Congolese forces battling the ADF, two security sources and local media said on Friday.