The Daecheong incident, also known as the Battle of Daecheong, was a skirmish between the South Korean and North Korean navies near the Northern Limit Line (NLL) on 10 November 2009 off Daecheong Island. The incident began at 11:27 am when a North Korean navy patrol boat crossed the NLL, which is not recognized by North Korea (DPRK). After two verbal warnings from South Korean naval units, one of the South Korean patrol boats fired a warning shot. In response, the North Korean boat began firing at the South Korean ship. A patrol boat from the DPRK was seriously damaged, with eight casualties while the navy of South Korea (ROK) sustained no casualties.