21. During the signal flags at that time. 22. Is that the signal flag the president wants America to fly on his tour ? ( BOX) 23. Rodgers used his signal flags to trick " Highflyer " into believing that " President " was. 24. A marine vessel is required to signal flag ( white border with one central blue square ). 25. They hand-washed cloth diapers and hung them to dry on the yardarm where they usually put signal flags . 26. The Confederate batteries mistook Gilbreath's handkerchief as an actual signal flag , opening fire and giving away their position. 27. Clothing that is yellow, green or red is disallowed because those colours are the colours of signal flags . 28. Ships in formation reverted to pre-wireless methods, including semaphore and signal flags , with signal lamps used at night. 29. The first was not answered because the Germans did not understand the coded plain-language Morse and signal flag . 30. Naval signalling was briefly considered and he suggested a simple system of thirty-six signal flags of three colours.
