Wilmot wrote that "contrary to contemporary reports, the Americans did not capture Argentan until 20 August, the day after the link up at Chambois". The American unit that closed the gap between Argentan and Chambois, the 90th Division, was according to Hastings one of the least effective of any Allied army in Normandy. He speculated that the real reason Bradley halted Patton was not fear of accidental clashes with the British, but knowledge that, with powerful German formations still operational, the Americans lacked the means to defend an early blocking position and would have suffered an "embarrassing and gratuitous setback" at the hands of the retreating "Fallschirmjäger" and the 2nd and 12th "SS-Panzer" divisions. Bradley wrote after the war that: