In the I Corps Tactical Zone, North Vietnamese forces overran South Vietnamese defensive positions in a month-long battle and captured Quảng Trị city, before moving south in an attempt to seize Huế. PAVN similarly eliminated frontier defense forces in the II Corps Tactical Zone and advanced to seize the provincial capital of Kon Tum, threatening to open a way to the sea, which would have split South Vietnam in two. North-east of Saigon, in the III Corps Tactical Zone, PAVN forces overran Lộc Ninh and advanced to assault the capital of Bình Long Province at An Lộc.