The Korean war began when around 75,000 soldiers from the North Korean People's army poured south of the 38th parallel, which represented the border with the pro-Western Republic of Korea. This war actually represents the first war of the Cold War period.
The Korean War began when some 75,000 soldiers from
the North Korean People's Army poured into South Korea, across the 38th
parallel, the boundary between the Soviet-backed Democratic People's Republic
of Korea (North Korea) and the pro-Western
Republic of Korea to the south.