Artillery boomed, shaking the ground, as a couple scurried through the streets of Saké, their possessions balanced on their heads, in the embattled east of the Democratic Republic of Congo.

At a crossroads, they passed a giant poster of Congo’s president, Felix Tshisekedi, who is standing for re-election on Dec. 20. “Unity, Security, Prosperity,” read the slogan. They hurried along.

“Our children were born in war. We live in war,” Jean Bahati, his face beaded with sweat, said as he paused for breath. It was the fifth time that he and his wife had been forced to flee, he said. “We’re so sick of it.”

They joined 6.5 million people displaced by war in eastern Congo, where a conflict that has dragged on for nearly three decades, stoking a vast humanitarian crisis that by some estimates has claiming over six million lives, is now lurching into a volatile new phase.

Making sense of the mayhem is not easy. Over 100 armed groups and several national armies are vying for supremacy across a region of lakes, mountains and rainforests slightly bigger than Florida. Meddlesome foreign powers covet its vast reserves of gold, oil and coltan, a mineral used to make cellphones and electric vehicles. Corruption is endemic. Massacres and rape are common.

For all that, aid groups struggle to draw attention to the suffering in a country of about 100 million people, even when the numbers affected dwarf those of other crises.