On June 25, 1950 ~ 90,000 soldiers of the Korean People’s Army (KPA), well-trained and equipped with modern tanks, trucks, artillery and small arms by the USSR, crossed the 38th parallel in eight divisions and an armored brigade to invade South Korea.

The 98,000-man Republic of Korea Army (ROK) was incompletely-trained and under-equipped with no tanks, inadequate artillery and few aircraft.

Frank Praytor @ Stars & Stripes

Aided only by a 500-man U.S. Korean Military Advisory Group (KMAG), the ROK army was quickly overwhelmed as the KPA advanced rapidly toward Seoul.

CBS News