Ossuary

[Achebe]

It is the bones. ...just my POV, but I think it reads better without the 'it is' eg. the bones - / the rattle and crack of what etc. (though even here the two 'thes' are painful...)
 
It is the rattle and crack of what remains
as the caws of the corvids scrape across tar, ... 'across tar' is a bit tricky on the tongue, at least mine
crying for flesh; feeding their young.
 
The young remain
forced into the thousand crosses
of Calvary; bound as the countless ...I wonder if instead of a direct reference to 'Calvary', which come across as a bit heavy handed to me, it might be better to reference a 'hill' or something of that sort. I like the idea of what are presumably war graves as bringing to mind the crucifixion of the young, and the overall idea of Calvary, just not the direct reference.
virgins frozen under the hands ....the enjambment in the above line is unexpected and works very well
that will raise them to whore.  ... I didn't quite get this. the hands of the state? the hands of fate? neither will necessarily raise them to whore
 
Our nests are thorns dipped in gold. ... I assume this is a reference to the writer's generation, not the dead men's
Old temples crush the new ...didn't get this
and call it charity.  Images line the walls
of the grave. ...overall, this strophe is a bit of a comedown from the previous
 
Miracles run black over
withered palms; the sheep eat the shepherds
and are reborn in the mud.  All eyes turn ... would it sound better without the 'and' and a comma in the previous line?
to mirrors: the images diminish.
 
When you see the blow, you know
it is not for you.  Your hands are pressed
together and your ears are filled
with dirt.  We are not crows, to sift
through filth to thrive... on its own, a nice strophe. could be its own poem
 
In the end, it is not the bones
but how you break them. ...I'm not a big fan of executive summaries, but that's just me

I liked the build up to the second strophe, but thereafter found it hard to follow.
Thanks for posting.