That's also possible.

However, be warned; Sharon & co have long since managed to stir the hornet's nest, both parties having failed on stealth completely. Which means that the fortress's garrison will be on full alert and maximum readiness.

Aerial entry will be possible. Though it will be up to Rae and her friends to not get completely obliterated by the wave of magical spells & missiles, flak and other projectiles that will surely be thrown at them as they approach. 

In other words, they will be going in (very) hot :P