On 29 June 2002, a North Korean patrol boat crossed the northern limit line and was warned to turn back.
At 10:25, the vessel that first crossed the line opened fire with its 85 mm gun and scored a direct hit on the wheelhouse of PKM-357 causing several casualties.
Now heavily outnumbered and taking casualties, the North Korean vessels retreated back across the Limit Line at 10:59.
Yoon Yeong-ha, Jo Cheon-hyung, Seo Hu-won, and Hwang Do-hyeon (during the battle), Park Dong-hyeok (days later), and Han Sang-guk (found at sea); Eighteen others were injured.
The injured North Koreans were reportedly quarantined in a hospital in Pyongyang to hide the extent of the casualties suffered in the battle.