WWII Artillery Delivery

Recently I read about a case in August 1944 in France several American units of the 30th division were encircled by the Germans. To support them “Medical supplies were fired into the American positions by artillery shell.”

My question is do any of you guys know of other times and places where artillery was used for special express delivery as in this case?

Where did you read that?

Artillery shells were also used to spread propaganda leaflets.

This web site talks about it:
http://ww2today.com/10-august-1944-attempt-to-resupply-hill-314-by-air-and-shell
Also repeated here:

The location was just outside of Mortain, France, and it occurred on August 10, 1944. Reportedly they took the propaganda leaflets from shells and replaced them with medical supplies.

This info comes from:

Overlord:D-Day & the Battle for Normandy

by Max Hastings

published in 1984

page 286

Would have been occurring during second week of August 1944

“Medical supplies were fired into the Americans positions by artillery shell.”

Found an article:

" 1944 US Army attempt to resupply Hill 314 by air and shell."

With technical details!

Mail has been delivered via sub launched cruise missile:

I suspected smoke canisters.

Safer to dismantle.

I wonder if the chemical mortars were used.

(BTW–I know the US did not use Chem Weapons in WW2. But were had them, & a lot of Chem Artillery units were used to lay down smoke screens.)