Underwood & Underwood
n.d.
This is probably the biggest enlargement ever made of a photograph. It shows the Canadian advance at Vimy Ridge and measures eight feet in height and about fifteen feet in width

Magazine illustration
Google Books
"Remarkable Photograph of an Actual Battle Scene", Popular Science Monthly, p. 747

One of the most remarkable war photographs taken by the official photographer of the British army in France is reproduced in the accompanying picture from the excellent enlargement, eight by fifteen feet in size, which was recently placed upon exhibition. This picture, probably the large war photograph ever made, shows a wide portion of the battlefield during the actual advance of the Canadian troops at Vimy Ridge, on the morning of April 9, 1917. The smoke in the background is produced by the counter-barrage of the Germans, which was particularly aimed at a line of tanks. The Canadian curtain of fire has already swept over the battlefield and is no longer visible.

 
LL/56436