Campanelle was awarded the Commonwealth Cup at Royal Ascot following a dramatic stewards' inquiry, having initially been beaten in a photo-finish by Dragon Symbol.
Winner of the Queen Mary 12 months ago, Campanelle was in the firing line throughout under Frankie Dettori and while all her rivals were seemingly feeling the pressure in behind, Wesley Ward's filly was still travelling well.
However, suddenly Oisin Murphy's mount Dragon Symbol (4-1) quickened smartly and headed Campanelle, with the two then pulling clear of the pack.
With Campanelle (5-1) drawing back alongside Dragon Symbol, Archie Watson's three-year-old began to drift to his right, carrying the American across the track with him.
Murphy switched his whip into his right hand, getting his mount straightened up, and the two went at it hammer and tongs for the final half a furlong.
There was little between them as they flashed by the line together, with Dragon Symbol a head in front before the inevitable inquiry was called.