Assertion: arsenal's manager | /r/HasProperty | arsenal's arsène wenger
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text: There was also an enmity between the managers, Arsenal's Arsène Wenger (1996–2018) and United's Sir Alex Ferguson (1986–2013), and club captains Patrick Vieira and Roy Keane, and their contests often involved on-field trouble – seven red cards were shown in matches from February 1997 to February 2005.