South Korea Map PowerPoint SketchBubble . United nations (un) forces advanced rapidly into north korea with the intention of reuniting north and south korea before. During the attack, the b company, 31st infantry, became separated and isolated along the road. North Korea and South Korea Map 669027 Vector Art at Vecteezy from www.vecteezy.com Neither man had given any thought to korea when they learned that the u.s. On 17 august 1950, after the outbreak of the korean war, the 7th marines was reactivated as part of the 1st marine division.on 21 september 1950 the regiment landed at inchon and took part in the recapture of seoul.on 7 october 1950, after 22 days of fighting, 7th marines, situated north of the han river was relieved by units of the us & rok armies and retired to a staging. Coalition in an effort to push back north korea’s invasion of its southern sibling nation on june 25.