Tension with the Soviet Union and China came to a head in the Korean War, and it became clear that the peacetime Navy would have to be much larger than ever imagined. Fleets were assigned to geographic areas around the world, and ships were sent to hot spots as a standard part of the response to the periodic crises. However, because the North Korean navy was not large, the Korean War featured few naval battles; the combatant navies served mostly as naval artillery for their in-country armies. A large amphibious landing at Inchon succeeded in driving the North Koreans back across the 38th parallel. The Battle of Chosin Reservoir ended with the evacuation of almost 105,000 UN troops from the port of Hungnam.