Someone had blundered- : a historical survey of military incompetence : Regan, Geoffrey : Free Download, Borrow, and Streaming : Internet Archive

White was winning, but blundered. Can you take advantage? : r/chess

Despite first pick, Chargers' J.C. Jackson blundered vs. Miami: 'Bad mistake by me

Stockfish says I blundered twice by sacrificing my rook and knight for a queen? - Chess Forums

Nothing stands out so conspicuously, or - Quote

Someone had Blundered; The story of the 'Repulse' and the 'Prince of Wales'. By Bernard Ash. London: M. Joseph. 1960. Illust., maps, bibliography. Pp. 255. 21s., Journal of Southeast Asian History

Don't be Blundered by Big Data

I blundered my queen

World War I: How Germany Blundered into book by Matthieu Santerre

Define Blunder, Blunder Meaning, Blunder Examples, Blunder

A failure is a man who has blundered, but is not able to cash in