KABUL, Afghanistan — Approximately 300 United States Marines will return this spring to help fight a resurgent Taliban in the southern Afghan province of Helmand, the site of a yearslong bloody campaign, American officials in Afghanistan said on Saturday.

An American military spokesman in Kabul said the Marines would replace an Army unit stationed in Helmand, and would offer training and advice to members of the Afghan military and the national police.

“The Marine rotation is to replace soldiers currently here conducting the train, advise and assist mission,” said Brig. Gen. Charles H. Cleveland, a spokesman for United States forces in Afghanistan. “We’re very pleased that the Marines will rotate in, as they have tremendous institutional history in the region.”

The Marines were last in Helmand, a hotbed of Taliban fighters and poppy cultivation, in October 2014. Since then, Afghan forces, suffering from leadership woes and plagued by corruption, have struggled to hold territory, with district after district falling to the Taliban. For months now, the insurgents have been at the gates of the provincial capital, Lashkar Gah.