Right - 'Ammunition Up, July 22 1918'
Below Left - a Carrick sketch which he appears to have reproduced on a small postcard, perhaps photographed by his friend the Belgian artist Beun? The ruins in the distance are Ypres.
Below Right a collage of sketches on Carrick's notebook showing an 8" howitzer.
The subject matter and linear composition of the sketches suggest that Carrick certainly drew on his sketch book as a source for the artillery and engineers panel designs.