FA Cup heroics from Peterborough, Arsenal march on

By Ian Chadband LONDON (Reuters) - Third tier Peterborough United produced the performance of the FA Cup fourth round when they twice battled from behind in the dying minutes to earn a 2-2 draw at Premier League West Bromwich Albion on Saturday. On a day when the big guns largely extinguished the hopes of the dreaming underdogs, the League One side proved indomitable after Saido Berahino, given a rare start, had twice put Albion ahead at the Hawthorns. Peterborough's heroes were Shaquile Coulthi