Afghan officials have blamed the Taliban for attacking their security checkpoints in northern Sari Pul province, leaving at least seven members of their forces dead.
The insurgents also abducted two members of the force and left five wounded, officials said, adding that four Taliban fighters were killed in the gun battle.
The troops were in charge of providing security for fuel wells in the area.
The Taliban is yet to claim responsibility for Sunday's attacks.

Shooting at Australia's Bondi Beach kills 12
Police hold person of interest after Brown University shooting leaves two dead
Hamas says Israel's killing of senior commander threatens ceasefire
Ukraine's Zelenskyy ditches NATO ambition ahead of peace talks
Thailand declares curfew along coast as Cambodia border fighting spreads
