Did you think as the hearse rolls by
That sooner or later you and I
will be rolling along in the self-same hack
And we won't be thinking of coming back?

The maggots and worms shall cover your skins,
And slowly they'll crawl all over our chins,
And we'll lose most of our fingers and all of our toes
And our great, brainy brains shall run out of our nose.
There, as friendly as friends, as they crowd all around,
And as far as they can they'll go down, down,
And they'll invite their friends and the friends' friends, too,
And you'll only be bones when they're done with you.

From the "Recollections of the War in Europe, From June 1917 to February 1919" by Captain Louis Julian Genella. p.510, New Orleans Medical and Surgical Journal. Volume LXXI, June, 1919. No. 12.

See google books here: https://www.google.com/books/edition/The_New_Orleans_Medical_and_Surgical_Jou/qt1DAQAAIAAJ?hl=en&gbpv=1&dq=%22as+the+hearse+rolls+by%22&pg=PA510&printsec=frontcover