11. At 1 : 30 Preble raised his signal flag to begin the attack on Tripoli. 12. In open warfare, visual signalling ( employing signal flags and the heliograph ) was the norm. 13. As they approached Canrobert's Hill, two signal flags were observed, signifying the approach of the Russians. 14. The drums would beat and the signal flags wave, telling the lancers to begin their charge. 15. Shortly after the fog lifted, the crew sighted the destroyer and signalled her with signal flags . 16. Just then the " Manawatu " came into sight, saw them and hoisted a signal flag . 17. Cao Cao was very impressed with Zhang Liao and he passed him his personal signal flag . 18. Maybe a set of those insulated Mount Gay tumblers with marine signal flags emblazoned on the sides? 19. This code assigned the digits 0 to 9 to ten signal flags , which were used in combination. 20. Additionally, the Imperial Lighthouse Service issued a set of signal flags to all lighthouses in the Bahamas.
