Washington ? The U.S. military is openly telegraphing a plan to clear out an insurgent haven in what may be the first major battle since President Barack Obama’s expansion of the Afghanistan war, hoping that all but the most hardcore Taliban will sit out the fight.

U.S. military leaders have spoken bluntly in recent weeks about a looming assault on Marjah, a town in the southwest Afghan province of Helmand described as Taliban-owned and operated.

“It’s been increasingly clear for weeks now about the need to clear out Marjah, so that’s going to happen,” Joint Chiefs of Staff Chairman Adm. Mike Mullen told reporters traveling with him in Afghanistan in December. “It’s going to happen … at a time and place of our choosing, but it’s going to happen.”

The battle would be a keystone in an offensive planned for early this year against a resurgent Taliban-led insurgency. The Obama administration approved the offensive, and an infusion of 30,000 additional U.S. forces, as a way to put the brakes on the Taliban’s expansion across southern Afghanistan.