Second Battle of Yeonpyeong
Also called: West Sea Engagement
On the day of the World Cup third-place match, a North Korean patrol boat that had crossed the Northern Limit Line ambushed the South Korean patrol boat Chamsuri 357, killing six sailors.

Travis Simmons via Commander, U.S. 7th Fleet · CC BY-SA 2.0 · Source
On the morning of 29 June 2002, west of Yeonpyeong Island, a North Korean patrol boat that had crossed the Northern Limit Line opened fire without warning on the South Korean patrol boat Chamsuri 357 as it moved to block it. In about 30 minutes of fighting six sailors, including the commander, Lieutenant Yoon Young-ha (posthumously promoted to lieutenant commander), were killed and 19 wounded; Chamsuri 357 sank while under tow. The North Korean boat withdrew badly damaged.
It was the day South Korea played Turkey for third place at the Korea/Japan World Cup. The government first called it the "West Sea Engagement" and renamed it the Second Battle of Yeonpyeong in 2008.