signal rocket

At that time he escaped but was afterwards pardoned; the signal rocket was to be fired from his storehouse in Cavite.

From The Katipunan or The Rise and Fall of the Filipino Commune by Francis St. Clair

In a moment a warning red signal rocket shot into the sky and burst, warning all local aircraft.

From The Black Tide by Arthur G. Stangland

The officers there had plainly seen the signal rocket this time, and the green ball seemed to shoot up into the clouds from directly beneath the bow of the "Long Island."

From The Battleship Boys' First Step Upward or, Winning Their Grades as Petty Officers by Frank Gee Patchin

But that only decided me the more to go on; and as the signal rocket was fired, the word was given, and on we went.

From Tom Burke Of "Ours", Volume I by Charles James Lever

Presently, while the two waited, a signal rocket came blazing out of the east, swept a wide curve in the sky, and dropped out of sight.

From Boy Scouts in Mexico; or on Guard with Uncle Sam by G. Harvey (George Harvey) Ralphson