STC311071 \'Keep your mouths open!\' An order always necessary when guns are in hot action, from \'The Illustrated War News\', 1916 (litho) by Woodville, Richard Caton II (1856-1927) (after); Private Collection; (add.info.: Keeping their mouths open is intended to prevent damage to the ear drums of soldiers caused by the reverberations and noise of the artillery;); The Stapleton Collection; English, out of copyright.