Rerouted Soldier Mail 1919

Here's a cover I got today, who's condition leaves a lot to be desired (that seems to happen to me a lot lately!) but I thought interesting and got cheap.
The stamp is missing, the envelope torn. It is addressed to Lieut. Clifton W Pennecott C.A.M.C. BEF (British Expeditionary Forces?) Siberia.
The exact location in Siberia is covered by a piece of brown paper, so I can't read it - even holding it up to the light. On the brown paper is written N. D. No. 1 London Ont.
It is originally postmarked in London on May 15, 1919 with a slogan cancel "Buy War Savings Stamps and Help Reconstruction".
The purple oval cancel over where the stamp was reads
"Returned Overs(eas) Mail Dept June 24 1919 M.D. No. 11 Vancouver BC"




The back cancel is only partially visible - London Oct(?) 29 with another slogan cancel Let Us Not Demobilize Patriotism Buy Victory Bonds"




At least the letter was still inside. A lovely four pager from Lieut. Pennecott's Mom, with an embossed image of US, French and British flags on top - 'For Liberty'

A little-known chapter of American military history - U.S. troops join the British in northern Russia, after World War I:

"...The Polar Bear Expedition (also known as the Northern Russian Expedition, the American North Russia Expeditionary Force - ANREF or the American Expeditionary Force North Russia - AEFNR) was a contingent of about 5,000 U.S. troops that landed in Arkhangelsk, Russia as part of the Allied intervention in the Russian Civil War and [under British command] fought the Red Army in the surrounding region during the period of September 1918 through July 1919."

Your cover may pertain to the British contingent.

CAMC = Canadian Army Medical Corps

This is likely the same person, the obiturary taken from the Canadian Medical Journal of 1968:

Too bad the cancellation wasn't complete, but, the Military District cancel is a nice one.

Mail addressed from or to the NREF forces are hard to get. Canadian forces (and other countries) were in Russia for only a few months.

Chimo

Bujutsu