Hi!

If I understood correctly you want to return your forces from that castle? For this you must go to your Keep \ Fiefs section and there you'll find the castle was besieged by you, click on the arrow from the right side of that line and the line with castle will expand and there you'll see all your troops. Also, you'll see a button with Recall - this is how you can recall your troops.....

Best regards!

Lord MAQNRHM

as Lord Bogdam said you have to find him on fief list and click on recall button

but you also can find him in garrisons tab also showed in pic above, go there look for the castle you have ur troops and recall selecting all

they will soon return to ur castle

Regards