Defend Your Allies Vigorously: North Korea attacked South Korea in 1949. Kim Il Sung wanted to crush the south. The republic of South Korea at the 38th parallel was chiefly agricultural while North Korea was purely industrial. Korea is an extremely small country. The NKPA (North Korean People’s Army) was marching south to conquer the entire peninsula. In the summer of 1949, the UN (mostly US army) fought and fell back. The equipment could not prevent the USSR tanks from crossing the line. It was a dark chapter but the UN and South Koreas held down the south. McArthur was responsible for the UN army. Truman called for 60,000 men to South Korea. Truman had to ask how they could afford to defend Korea with only 10 divisions after years of cutbacks in the military. Truman didn’t want to commit everyone to Korea or he might leave US susceptible to attack. Truman didn’t like McArthur’s ridiculousness. McArthur had a heroic standing. The UN forces appeared in Korea under the international flag: a testament to the emerging international law.