The 19th day. At dawn, as the Duke was in the midst of urging on the battle, he was suddenly struck by a stray bullet. The Duke said, "The battle is now at its height — on no account let it be said that I have died." Having spoken these words, he passed away.

Notes from Wikiquote

Yi Chungmugong jeonseo, Yi Bun, "Haengnok" (行錄, by his nephew, Vice Director Bun). Original text, Database of Korean Classics