They strengthened the castle structure but it did not help, for Owain Cyfeiliog and his Norman allies attacked Castle Caereinion and destroyed the fortifications, after which the site seems to have been abandoned.
Little remains now beyond the raised mound of the motte in a corner of the churchyard. The motte stands only 3 metres high, and is about 20 metres in diameter.
A shallow depression to the south of the mound marks the likely site of the earthwork defences. The mound was built near the main route from Welshpool (now the A458).