[Fiji Hill]

The original version is much more evocative of the time, with only the lonely, haunting accompaniment of the Hammond organ, giving a poignancy to the parting of troops going off to fight a war many of them would never return from and no one perhaps believing it would last six long years and with horrors unimaginable even compared to the previous war.

Here's another one that generates a similar feeling.

A Mother's Prayer at Twilight--Vera Lynn (1940)

[PotatoHeadMick]

Two more of my favourites are “It’s a Lovely day Tomorrow” and “Bless them all” (”Bless them all, bless them all, bless the long and the short and the tall...”).

I have to admit that I became fond of the second one after discovering that “bless” was substituted for the actual verb originally sung by British Tommies, which as you can guess was somewhat more profane.