to a crushing defeat. Treachery of Govinda Vidyadhar and Second Battle of Mandarana Fort After the conquest of the fort Govinda Vidyadhara, a traitor who happened to be a high ranking commander of the Odia ranks changed sides in his greed for the throne of Odisha and joined the Sultan of Bengal. Though the fighting had stopped for a while, it resumed when the Alauddin got support from Govinda Vidyadhara. A severe conflict ensued in the same site and possibly the Mandarana fort fell back into the hands of the Hussain Shahi forces. The Odia army didn't retreat instead continued to hold up the Muslim armies on the northern frontiers reinforced by the orders of the Gajapati. Seven Years War with Vijayanagar and downfall of the Empire (1512-1519 A.D) Krishnadevaraya became the king of Vijayanagar in the year 1509. Sensing the threat posed by the Gajapati forces in the south, he was advised by his minister Timmarusu to undertake a military campaign for occupying the forts like Udayagiri, Kondapalii and Kondavidu under the control of Odia forces. Also, the timing was apt as Prataparudra Deva was himself absent in the Deccan and was indulged in conflicts with the Muslim forces of Bengal. Krishnadevaraya first subdued the Velama chiefs of the Telegana region who were the allies of Gajapati king from the times of Kapilendra Deva Routaraya. He then marched on to the Udaygiri fort. Seizure of Udayagiri Fort and resistance by Odia forces (1512-1514 A.D) Udayagiri fort was guarded by an Odia garrison of 10,000 infantry, 400 cavalry and 8000 other men deployed at the outskirts of the fort. The guarding force was commanded by the paternal uncle of the Gajapati himself, Tirumala Routaraya. A strong contingent of Vijayanagar forces numbering 34,000 infantry and 800 war elephants marched through Gutti and Gondikotta laid a seize on the fort in the year 1512. A brave defensive hold out and consistent fight across the outer wall of the fort continued for 18 months without any help reaching to the combatants from Odisha. Portuguese traveler Fernao Nunes accompanying the Vijayanagar ruler writes that as the generals of Krishnadeva Raya failed to capture the fort, he himself took the charge. Frenao also mentions that there was a severe fight to tooth and nail put up by the forces from both the sides and the Odia forces were fighting with a strong determination to defend