Armistice Wind - Edit2

[RiverNotch]

On Friday last, an hour before Last Friday?
the sun reached its meridian Before noon. Is there any specific significance to meridian? A reference to any treaties? If none, it's awkward.
I listened indoors for the crash
of guns.

Policemen shoot them on this day I don't think "on this day" is necessary -- "every year" should be enough.
each year in my town’s graveyard, blanks
to symbolize an armistice ~ I find the tension here a little false, since the armistice did mean peace. Perhaps an armistice does not typically mean a lasting peace, but in this context, it did --- well, that's excluding World War II, but that particular piece of commentary I don't think is here discussed.
not peace.

At first no shots, just acorns falling
rattled like spent bullets on 
hunched helmets as they struck my roof
and rolled. I find the construction of this whole stanza particularly awkward, not because of the change in the first line (in fact, I think you could bend the meter a greater deal), but because this sentence is a fragment. It communicates, sure, but not -harmoniously.

Between, wind stirred dead leaves and limbs Between what?
to rustle, flutter, softly thunder,
warning ghost of distant drumfire
waking.

Then louder, rushing past, that gale
blew shrill, demanding pan-pipe notes ~ Besides exceeding its usual purpose, the tildes here are just too loopy -- instead of suspense, I get playfulness. Better here a colon or an em dash (in fact, I read this as having the potential to go wild with em dashes, but better not), earlier a comma, and later a period or semicolon.
trench-whistles calling men to rise
and fall.

So Friday last I never heard So last Friday? Again, awkward.
those guns proclaiming armistice ~
some wind had carried their reports
away.
Otherwise, fair enough.