Among the leaders of the expedition were Laksamana Khoja Hassan and the Hulubalang Sang Setia, Sang Naya, Sang Guna, Sang Jaya Pikrama, and Tun Biajid. The forts at Pekan were strengthened, the people mobilized, and the arms got ready. There was delay in completing the main fortification called the 'Fort of Pahang', also known as Kota Biram, which stood on the site of the modern Sultan Abu Bakar Museum, but it was eventually completed before the invasion.