Yakin Perimeter na Pusan ​​yana daya daga cikin manyan ayyukan farko na yakin Koriya.Dakarun dakaru 140,000 na Majalisar Dinkin Duniya, bayan da aka tura su gaf da shan kaye, an hada su domin yin wani mataki na karshe don yakar sojojin Koriya ta Arewa (KPA) da suka mamaye, mazaje 98,000.Dakarun Majalisar Dinkin Duniya, bayan da KPA da ke ci gaba da samun nasara akai-akai, an tilasta musu komawa zuwa "Pusan ​​Perimeter", wani layin tsaro mai nisan mil 140 (kilomita 230) a kusa da wani yanki a kudu maso gabashin Koriya ta Kudu wanda ya hada da tashar jiragen ruwa na Busan.Dakarun Majalisar Dinkin Duniya, wadanda akasarinsu na sojojin Koriya ta Kudu (ROKA), Amurka, da kuma Burtaniya, sun tsaya tsayin daka na karshe a kewayen kewayen, inda suka yi ta gwabzawa da hare-haren KPA da aka yi ta tsawon makonni shida, a lokacin da suke zagaye da garuruwan Taegu. , Masan, da Pohang da Kogin Naktong.Hare-haren na KPA bai yi nasara ba wajen tilastawa sojojin na Majalisar Dinkin Duniya komawa baya daga kewayen, duk da manyan hare-hare biyu da aka yi a watan Agusta da Satumba.Sojojin Koriya ta Arewa, wadanda ke fama da karancin kayayyaki da hasara mai yawa, sun ci gaba da kai hare-hare kan dakarun Majalisar Dinkin Duniya a yunkurin kutsawa cikin kewayen da kuma ruguza layin.Sojojin Majalisar Dinkin Duniya, duk da haka, sun yi amfani da tashar jiragen ruwa don samun fa'ida mai yawa a cikin sojoji, kayan aiki, da dabaru.Bataliyoyin tankunan da aka tura zuwa Koriya kai tsaye daga babban yankin Amurka daga tashar jiragen ruwa na San Francisco zuwa tashar jiragen ruwa na Pusan, tashar jiragen ruwa mafi girma na Koriya.A ƙarshen watan Agusta, yankin Pusan ​​yana da tankuna 500 na yaƙi da shirye-shirye.A farkon watan Satumba na shekarar 1950, sojojin Majalisar Dinkin Duniya sun zarce na KPA 180,000 zuwa 100,000.Sojojin saman Amurka (USAF) sun katse kayan aikin KPA tare da nau'ikan tallafin ƙasa guda 40 na yau da kullun waɗanda suka lalata gadoji 32, tare da dakatar da yawancin titina na rana da na dogo.An tilastawa dakarun KPA su buya a cikin ramuka da rana kuma suna motsi da dare kawai.Don hana KPA kayan aiki, USAF ta lalata ma'ajiyar kayan aiki, matatun man fetur, da tashar jiragen ruwa, yayin da sojojin ruwan Amurka suka kai hari wuraren sufuri.Saboda haka, ba za a iya samar da KPA da aka yi yawa a duk faɗin kudu ba.