 The urgency of the threat to Pusan Perimeter prompted the US Marine Corps 1st Provisional Marine Brigade to be brought in to reinforce the US Army troops . In two weeks of heavy fighting , the US forces were able to force the North Koreans out of the Naktong Bulge region . The North Koreans were further repulsed after the UN counterattack at Inchon , which culminated in the virtual destruction of the North Korean army . 
 The urgency of the threat to Pusan Perimeter prompted the US Marine Corps 1st Provisional Marine Brigade to be brought in to reinforce the US Army troops . In two weeks of heavy fighting , the US forces <a href='uninflect' title='1'><mark>were</mark></a> able to force the North Koreans out of the Naktong Bulge region . The North Koreans <a href='uninflect' title='2'><mark>were</mark></a> further repulsed after the UN counterattack at Inchon , which culminated in the virtual destruction of the North Korean army . 
The urgency of da threat to Pusan Perimeter prompted the US Marine Corps 1st Provisional Marine Brigade to be brought in to reinforce tdaUS Army troops . In two weeks of heavy fightin , the US forces was able to force thdaorth Koreans outt of the Naktong Bulge region . The North Koreans was further repulsed after the UN counterattack at Inchon , which culminated in thedartual destruction of the dath Korean army .