Answer:
What has holes on each side, but can still can hold water?
The eight of us go forth not back to protect our king from a foes attack.
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
They are the shore's gallant knights.
Thanks for such treasures as Mariachis, enchiladas and habanero!
What is always coming but never arrives?