Roughly 140 miles (230 km) long, the perimeter stretched from the Korea Strait to the Sea of Japan west and north of Busan.

The battle went on for ten bloody days. Eventually, the American 24th Infantry Division and other crucial units were able to push back the North Korean army and destroy the entire 4th division. The battle inflicted heavy losses. 1200 North Korean and 600 American troops were killed.

Names. The name "Busan" is the Revised Romanization of the city's Korean name since the late 15th century. It officially replaced the earlier McCune-Reischauer romanization Pusan in 2000. During the Japanese occupation it was spelled "Fuzan".

During the Goryeo dynasty (935–1392) it was named Pusanp'o (Korean pu meaning “kettle” and san meaning “mountain,” for the shape of the mountain at whose foot it is situated, and p'o meaning “bay” or “harbor”). Busan is the country's largest port and second largest city.