Once inside you will see a Royal Infantry and a Trained Bat. You'll need to keep him alive and defeat the bat.
You must wait until the recruit is completely focused before killing the bat otherwise the mission will end in failure. You must wait for the message that he is fighting with vigor (or along those lines).
Once defeated click on the Dawn Aureola to leave. All members will be awarded 210 EXP.
Return to Rasdinice to complete the mission and receive 820 Allied Notes.