More on Knocked into a Cocked Hat from Infoplease:

• Knocked into a Cocked Hat - Knocked into a Cocked Hat Thoroughly beaten; altered beyond recognition; hors de combat. A ...
• cocked hat: meaning and definitions - cocked hat: Definition and Pronunciation
• Cocked Hat - Cocked Hat (A). A hat with the brim turned, like that of a bishop, dean, etc. It is also applied to ...
• Dictionary of Phrase and Fable: K - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "K"