 The North Vietnamese response to the incursion was to avoid contact with allied forces and , if possible , to fall back westward and regroup . PAVN forces were well aware of the planned attack and many COSVN / B @-@ 3 Front military units were already far to the north and west conducting operations against the Cambodians when the offensive began . During 1969 PAVN logistical units had already begun the largest expansion of the Ho Chi Minh trail conducted during the entire conflict . As a response to the loss of their Cambodian supply route , North Vietnamese forces seized the Laotian towns of Attopeu and Saravane during the year , pushing what had been a 60 @-@ mile ( 97 km ) corridor to a width of 90 miles ( 140 km ) and opening the entire length of the Kong River system into Cambodia . A new logistical command , the 470th Transportation Group , was created to handle logistics in Cambodia and the new " Liberation Route " ran through Siem Prang and reached the Mekong at Stung Treng . 
 The North Vietnamese response to the incursion was to avoid contact with allied forces and , if possible , to fall back westward and regroup . PAVN forces <a href='uninflect' title='1'><mark>were</mark></a> well aware of the planned attack and many COSVN / B @-@ 3 Front military units<a href='been_done' title='2'><mark></mark></a> <a href='uninflect' title='3'><mark>were</mark></a> already far to the north and west conducting operations against the Cambodians when the offensive began . During 1969 PAVN logistical units <a href='been_done' title='4'><mark>had</mark></a> already begun the largest expansion of the Ho Chi Minh trail conducted during the entire conflict . As a response to the loss of their Cambodian supply route , North Vietnamese forces seized the Laotian towns of Attopeu and Saravane during the year , pushing what had been a 60 @-@ mile ( 97 km ) corridor to a width of 90 miles ( 140 km ) and opening the entire length of the Kong River system into Cambodia . A new logistical command , the 470th Transportation Group , was created to handle logistics in Cambodia and the new " Liberation Route " ran through Siem Prang and reached the Mekong at Stung Treng . 
The North Vietnamese response to da incursion was to avoid contact with allied forces and , if possible , to fall back westward and regroup . PAVN forces was well aware of tdaplanned attack and many COSVN / B @-@ 3 Front military units done was already far to the north and west conducting operations against the Cambodians when the offensive began . During 1969 PAVN logistical units done already begun the largest expansion of the Ho Chi Minh trail conducted during thdantire conflict . As a response to thedass of their Cambodian supply route , North Vietnamese forces seized the datian towns of Attopeu and Saravane during the year , pushing what had been a 60 @-@ mile ( 97 km ) corridor to a width of 90 miles ( 140 km ) and opening the entire length of the Kong River system into Cambodia . A new logistical command , the 470th Transportation Group , was created to handle logistics in Cambodia and the nda" Liberation Route " ran through Siem Prang and reached the Mekong at Stung Treng .