On both Cartoon Network and the now-defunct WB! Station, two lines were edited, both of which used the word damn: 1) The Confederate Officer's line at the beginning "Damn Yankees" (which was cut entirely on CN via fake fade-out and shortened to remove the damn on the WB), and 2) Tweety's line after seeing Sylvester "I tawt I taw a damn Yankee Tat' (which was missing the word "damn" on CN and deleted altogether on the WB)
The syndicated "Merrie Melodies" show left both usages of the word damn in, but removed the scene where Sylvester gets blasted by several cannons on a ship while trying to catch Tweety (though this censored scene appeared as a "Hip Clip" on another episode of this program).