"I would here call your attention to the fact that rockets can be made available for day signals by removing the parachute and placing in its stead a blank cartridge open at the lower end. In very hilly country, where signaling with flags is not always practicable, this mode of signaling by day, I think, is very much to be recommended." Series 1 - Volume 29 (Part I) pg. 510
"This arrangement was subsequently found to be unnecessary, as the admiral had with him Ensign Adams, a naval officer who is well instructed in our code of signals. I provided each expeditionary party with two plain and two parachute rockets, to be used to designate as follows: Plain: We are successful. Parachute: We are repulsed." Series 1 - Volume 28 (Part I) pg. 45
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David Upton