Looking at the map below, the closest unit would have been the 2nd US Armored which was part of the XIX Corps. It is the last unit on the Left flank of the US forces. Then it is the Canadians and British. Cambrai is just NNE of Rouen.
http://www.mtmestas.com/Military/cam...p18-19-map.jpg
But I still cannot find documented accounts of any American units fighting in Cambrai but found this.
Quote:
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To fill the gap between XV Corps and V Corps, which had taken over the sector at Argentan, Bradley and Hodges moved Corlett's XIX Corps from the tip of the Falaise pocket, where it had been pinched out by the British advance, to the gap. They directed Corlett to strike northeast for Elbeuf on the Seine, cutting off the retreat of German forces resisting the British and Canadian advance to the river. Starting its attack on 20 August, the XIX Corps moved rapidly, scattering or capturing German units in its path. On 25 August it battered its way into Elbeuf, leaving only a narrow, exposed sector near the mouth of the Seine for the Germans to use as an escape route.
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Google Image Result for http://www.mtmestas.com/Military/campaigns/images/france-nothern/images/p05-map.jpg
Elbeuf is where the 2nd US Armored is located on the map above. So right now only a guess would point to this unit.