On the day of Amit Shah's arrival in Kolkata on Wednesday evening, West Bengal BJP once again demonstrated it was in full battle mode, skirmishing with the police at Central Avenue in the heart of the city. The police were trying to control a march by the BJP to the Mahatma Gandhi statue. It is a shot in the arm for Bengal BJP that Mr Shah is taking charge of the party's poll preparedness; BJP leaders have confirmed he will be leading the party in next year's state election.