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  You held up the flashing of your magic for a while longer, though you eventually tired of the casting.
What always helped after something like this was a short nap, and that was exactly what you would be taking; casting on such a large scale is something exhausting, and you knew damn well that using yourself up too much would be bad for your health.
Both the garrison and the besieging army had held quiet when you had unleashed that spell, made up of a mixture of fairly ineffective lightning bolts and ice. Yet the appearance of such a spectacle made the untrained eye grow wide. 
They were all in awe of you, and you knew very well you could have ended it here and now, but in accordance with your father's wishes, you held back. Still, that part of you, that innately curious part, had once been satisfied with the power at your fingertips, and now, your curiosity, long sated, was beginning to reawaken.
It made you wonder, as you drifted asleep, if you could do this with little to no artefacts at your side and a mage's staff of middling quality. What would you be capable of if you had more artefacts, more knowledge, and more power? As you drifted off into a peaceful sleep, visions of untapped potential danced in your mind, ever eluding you, though you were inevitably moving ever closer to obtaining it.
<span class="mu-s"> Meanwhile, with Albrecht and co. </span>
You had watched the show with great delight, attagirl! Go-getter! Sophia had proven her worth within this army, and you knew that even the silent critics of bringing a woman along for the campaign were now silenced. Among the common soldiery, there seemed to hang an air of certainty and even dread. Still the king's daughter, but now someone who could take on most of them in a fight and win, if magic were allowed, that is, though rules concerning combat fly out the window in life-or-death struggles.
You let her have her little nap; it must be important for her to properly rest. Which left you with the next step about what to do with the garrison of the castle, probably still reeling from the little spookery Sophia gave them. 
You had just flipped the table, with the Svengalians under it; they were holed up in there, like frightened mice.
But this cat had long paws with long, sharp claws. And reaching into the mousehole would be an easy thing.
>Demand their surrender.
>Have the siege ladders and battering rams readied.
>Bombard them with your artillery.