 All three regiments of the NK 2nd Division @-@ the 4th , 17th , and 6th , in line from north to south @-@ crossed during the night to the east side of the Naktong River into the 23rd Regiment sector . The NK 2nd Division , concentrated in the Sinban @-@ ni area west of the river , had , in effect , attacked straight east across the river and was trying to seize the two avenues of advance into Changnyong above and below Lake U @-@ p 'o . On August 31 , 1950 , Lake U @-@ p 'o was a large body of water although in most places very shallow . 
 All three regiments of the NK 2nd Division @-@ the 4th , 17th , and 6th , in line from north to south @-@ crossed during the night to the east side of the Naktong River into the 23rd Regiment sector . The NK 2nd Division , concentrated in the Sinban @-@ ni area west of the river , had , in effect , attacked straight east across the river and was trying to seize the two avenues of advance into Changnyong above and below Lake U @-@ p 'o . On August 31 , 1950 , Lake U @-@ p 'o was a large body of water although in most places very shallow . 
All three regiments of da NK 2nd Division @-@ tda4th , 17th , and 6th , in line from north to south @-@ crossed during the nite to thdaast side of thedaktong River into the dad Regiment sector . The Ndand Division , concentrated in the Sidan @-@ ni area west of the rivda, had , in effect , attacked str8 east across the rivedand was tryna seize the 2 avenues of advance into Changnyong above and below Lake U @-@ p 'o . On August 31 , 1950 , Lake U @-@ p 'o was a large body of water although in most places very shallow .