She was an Angel of Mercy by George Bert and Chas. Britton and tune by Lawrence Wright - see http://imagesearchnew.library.illinois.edu/cdm/ref/collection/myers/id/5236

SHE WAS AN ANGEL OF MERCY (partial lyrics)

In the book of judgment in years to come, the tale shall be ever told,
Of the brave Nurse Cavell, and how she died, in letters of purest gold
Hers was a glorious mission of love, amidst all the battle and strife,
Calm and serene, keep the name ever green, of the woman who laid down her life.

Refrain:
She was an angel of mercy, one of the Red Cross band,
Nursing the sick and the wounded, with a loving and tender hand,
Let us teach our children, the mem'ry must no die,
Of here sweet name, and her glorious fame, as the years roll by.

Verse:
What a grand, grand story, it thrills the hear, inspiring the poets pen,
Fulfilling that message sent from above, of peace and goodwill to men,
Tho' the grim spectre of war shall have pass'd, and peace reigns again on the earth,
Tho' she's at rest, her dear name will be bless'd, and shall live in the land of her birth.