References in classic literature ?
Cautiously I retraced my steps to where I had left Woola, and warning him to silence, signaled him to follow me.
Then, to Clayton's inquiries as to how they had happened to anchor off shore and fire a signal gun, the commander, Captain Dufranne, explained that a month before they had sighted the Arrow bearing southwest under considerable canvas, and that when they had signaled her to come about she had but crowded on more sail.
And Fouquet, bowing, with a smile, passed on like a commander-in-chief who pays the different outposts a visit after the enemy has been signaled in sight.