The venue was packed to capacity with the main game of the day played in sunny and windy conditions.
The Eagles looked the more dangerous side in the opening minutes as they dominated possession.
But it was the Mioks who got the first points from a penalty successfully converted by -eighth Philemon Taim.
In their next visit to the Eagles half, a dangerous tackle on a Mioks player presented the chance for them to extend their lead.
Taim attempted to convert from 25 metres out but his kick just sailed wide.
Dominating possession finally produced results for the Eagles with a try to Solo Memti who chased a grubber kick and pounced on it to score.
Scott Francis added the extras to make it 6-2.
But the Mioks responded with class from Presley Soto who scooted out from dummy half to score out wide.
A change in the kicking duties allowed the Mioks to hit the lead at 8-6 after Dicksy Anni booted the ball between the posts to hit the lead just before halftime.
Solid defence in the second half from the Eagles guaranteed them the win as they held the Mioks scoreless for the second 40 minutes.
The Eagles took back the lead late in the match after good vision to spread the ball out to the right wing saw David Kawage dive over.
Francis made it two from two to take a narrow 12-8 lead.
But it was enough to secure victory for the Eagles as they held on until the final whistle to win.