Having defeated the Bijapuri forces sent against him, Shivaji's army pressed into the Konkan and Kolhapur, seizing Panhala fort, and defeating Bijapuri forces sent against them under Rustam Zaman and Fazl Khan in 1659. In 1660, Adilshah sent his general Siddi Jauhar to attack Shivaji's southern border, in alliance with the Mughals who planned to attack from the north. At that time, Shivaji was encamped at Panhala fort with his forces. Siddi Jauhar's army besieged Panhala in mid-1660, cutting off supply routes to the fort. During the bombardment of Panhala, Siddi Jahuar purchased grenades from the British at Rajapur to increase his efficacy, and also hired some English artillerymen to bombard the fort, conspicuously flying a flag used by the English. This perceived betrayal angered Shivaji, who in December would exact revenge by plundering the English factory at Rajapur and capturing four of the factors, imprisoning them until mid-1663.