You shouldn't let it go to your head.
Because the important part is still to come.
So you actually managed to conquer the fortress.
If you don't defend it now, though, all that effort will have been for nothing.
Oh, if you've taken part in the Fortress Battle, you must have been assigned the title of [%dic:STR_DIC_I_Item_ldf5_f_all_title02].
As [%dic:STR_DIC_I_Item_ldf5_f_all_title02], you can receive a reward quest.
So take a look at the list and try to select the title of [%dic:STR_DIC_I_Item_ldf5_f_all_title02].