The military forces of Frostbate make it the strongest clan of the three. The spear of humanity and the kingdom that has seen several wars in the past.
The reason Alex devised the plan to attack the base at night is that the main forces of Frostbate remain all spread around Frostbate's territory, and returning to the main capital at this hour would have been difficult.
Although Edric and Celestria were strong, Alex knew it would be quite difficult for them to face the main force of Frostbate all by themselves.
....however, upon reaching the capital and gazing at the main palace, they knew that their plans were ruined
"There is no doubt...Eryndor has gathered all the forces here...." Edric muttered as a droplet of sweat trickled down his forehead as he looked at the number of soldiers stationed around the main castle.