Sunderland were dealt their first league defeat of the Regis Le Bris era on Saturday. Sunderland went into the game vs Plymouth Argyle with bags of optimism. The Black Cats were flying high at the top of the Championship table having won all four of their opening league fixtures this season. And it looked like Regis Le Bris’ men were on their way to a fifth-straight league win after a Patrick Roberts penalty in the first half. But a slow start to the second half saw Plymouth Argyle take the lead. Romaine Mundle continued his impressive form, and scored his third goal in as many games to seal w…