With thanks to Philippe Clerbout who very kindly found this WW1 poem for us.
The poem, entitled “Bre(a)d to the Colors”, was written by Blanche Elizabeth Wade and published in the June/July, 1918 issue of "American Cookery" magazine. As far as I can ascertain, Blanche was the only daughter of American author, poet and pictorial photographer Elizabeth Flint Wade (1849–1915) - Flint being her maiden name - and her husband, Frank Abernathy Wade. Blanche Elizabeth was born in 1872 and became the author of several popular books.
"American Cookery" was a monthly (except for July and August) journal published in New York, USA that began publishing under that title in 1914, succeeding "The Boston Cooking School Magazine of Culinary Science and Domestic Economics" and continuing its volume numbering. It ran until 1946.
If anyone knows more about Blanche Elizabeth Wade please get in touch.