The Kurram operation killed 12 infiltrators trying to enter from Afghanistan, ISPR said, and Naib Subedar Hidayat Aman, 40, from Ghizer was martyred in the clash.
ISPR said security forces foiled an infiltration from Afghanistan and killed 12 Khwarij and Afghan Taliban.
Dawn and Punjab Chief Minister Maryam Nawaz Sharif placed the attempt in Kurram district.
The military said Afghan Taliban posts opened fire to support the infiltrators.
Naib Subedar Hidayat Aman, 40, from Ghizer, was martyred in the exchange of fire.
Maryam Nawaz Sharif paid tribute to the forces and condoled with the soldier's family.