Upon the request of Badi Begum of Bijapur, Aurangzeb, now the Mughal emperor, sent his maternal uncle Shaista Khan, with an army numbering over 150,000 along with a powerful artillery division in January 1660 to attack Shivaji in conjunction with Bijapur's army led by Siddi Jauhar. Shaista Khan, with his better–equipped and –provisioned army of 80,000 seized Pune. He also took the nearby fort of Chakan, besieging it for a month and a half before breaching the walls. Shaista Khan pressed his advantage of having a larger, better provisioned and heavily armed Mughal army and made inroads into some of the Maratha territory, seizing the city of Pune and establishing his residence at Shivaji's palace of Lal Mahal.