Even by the fitting out of this unfortunate fleet, the zamorin did not fulfil the conditions of the confederacy against the Portuguese, as each of the high contracting parties had engaged to undertake some considerable enterprize against them in person; but he had been hitherto deterred by the presence of Diego de Menezes with a squadron in their seas, who burned several of his maritime towns and took many of his ships. Towards the end of June 1571, Diego de Menezes having withdrawn from the coast with his squadron, and when Adel Khan and the Nizam were both about to desist from their enterprises upon Goa and Chaul, the zamorin took the field with an army of 100,000 men, most of them armed with firelocks, with which he invested the fort of Chale about two leagues from Calicut, which was then under the command of Don George de Castro. Having planted forty pieces of brass cannon against the fort and straitly invested it with his numerous army so as to shut out all apparent hope of relief, a small reinforcement under Noronha was unable to penetrate; but soon afterwards Francisco Pereyra succeeded by an effort of astonishing bravery to force his way into Chale with a few men.
Advice being sent to the viceroy of the dangerous situation of Chale, Diego de Menezes was sent with 18 sail to carry supplies and reinforcements to the besieged. De Menezes got to Chale with great difficulty about the end of September, at which time the besieged were reduced to great extremity, having not above 70 men able to bear arms out of 600 persons then in the fort. The relief of the fort seemed impracticable, as the mouth of the harbour was very narrow, and was commanded on all sides by numbers of cannon on surrounding eminences. Diego resolved however to surmount all difficulties. A large ship was filled with sufficient provisions to serve the garrison for two months, and carried likewise fifty soldiers as a reinforcement. One galley preceded to clear the way and two others followed the large ship to defend her against the enemy. By this means, but with incredible difficulty and danger, the relief was thrown in, but it was found impossible to bring away the useless people from the fort as had been intended. Thus, by the valour and good fortune of the viceroy, this formidable confederacy was dissipated, which had threatened to subvert the Portuguese power in India, and their reputation was restored among the native princes.
Portuguese Transactions in India from 1571 to 1576.