The day after the failed parley Virnosian artillery brigades began to bombard the castle. They were immediately deterred by the activation of an arcane shield that protected the fortress from bombardment.
Adjusting strategy Lord Thannor ordered the newly-roused conscript militia to set an initial charge against the castle, which failed spectacularly. The Virnosian's adjusted strategy and started to throw heavy infantry, trained line infantry, and event the famed
Knights of Virnos at the Castle, incurring heavy casualties on the attackers. However after fierce fighting the defenders of the castle were left exhausted and with losses, leaving the inevitable outcome all too clear.
However, a large contingent of Atresan Army forces led by General Lastimora and
Baralas Oakenhollow arrived from the East, having bypassed the Battle of Brox Crossing to beeline for the Castle. The two armies clashed in magnificent fashion and all semblance of military order quickly evaporated as both the Virnosian and Atresan leadership failed to keep ranks and order straight. Units were commanded, at best, on a regimental or company level.
In general several key moments have been recorded. Including members of Guild Hyperios killing the leadership of the Virnosian military and stopping key Virnosian pushes including an attempt to disable the Atresan airships. These pushes allowed the Atresan military to both secure Castle Hyperios from further attack as well as slowly surround the Virnosian army, even if they weren't aware they were doing it.
After Lord Thannor, Lindra Thalsor, and Lambros Sosistas all fell in battle to Guild Hyperios command of Virnosian forces fell to Quinn Cam, the infantry commander. He quickly appraised the situation as bad based on what he had been hearing from his subordinates for the past hour, as well as general lack of conviction in the need for the battle at all. After Thalsor had died the majority of Virnosian forces had surrendered to the Atresans.