Herman: The Key To Springfield Has Always Been Elm Street.

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Herman: The key to Springfield has always been Elm Street. The Greeks knew it. The Carthaginians knew it. Now you know it.
The allusion here is to the movie Patton starring George C. Scott. In the movie, while planning the invasion of Sicily, Patton says "The key to Sicily has always been Sicacusa . . ." and says exactly what Herman says.
Episode: 7G05 Bart the General.