Own work based on :

• Rousset, Camille (25 May 2016) (in French) La Conquête d'Alger, Collection XIX ISBN: 978-2-346-06990-3. : "When the day came, they were quite surprised to see above their heads, and at the very top of the Kasbah, the red flag which usually flew over the Djennina, now open and deserted."
• Morrison, Dane A. (30 November 2021) (in English) Eastward of Good Hope: Early America in a Dangerous World, JHU Press, pp. 61 ISBN: 978-1-4214-4237-2. : "Whereupon the "federal flag" was hauled down and replaced with the red pennant of Algiers."
• عبد الرحمن بن محمد, جيلالي (1994) (in Arabic) تاريخ الجزائر العام للعلامة عبد الرحمن الجيلالي الجزء الثالث: الخاص بالفترة بين 1514 إلى 1830م, Algeria: الشركة الوطنية للنشر والتوزيع, pp. 31 (The General History of Algeria by Abd al-Rahman al-Jilali Part Three: Regarding the Period Between 1514 and 1830): "As for the government flag and its official banner in Algeria, it is red, with nothing on it, devoid of any symbol, announcing its separation from the authority of the Caliphs of Constantinople, whose flag contained the star and crescent. Sometimes the Algerians limited themselves to drawing the crescent on it only. There are flags and banners with different colors and symbols, and they are specific to sea vessels as a logo that distinguishes them from each other.."
• Belhamissi, Moulay (1996) (in French) Marine et marins d'Alger, 1518-1830: Les navires et les hommes, Bibliothèque nationale d'Algérie, pp. 110 ISBN: 978-9961-901-04-5. : "A flag, plain red, was carried by a large mast, surmounted by a copper ball, fixed on the Dey's belvedere. On holiday, while the red flag flew on the other ports, a large green standard embroidered with gold was hoisted at the Qasba.;" According to American consul in Algiers Cathcart, James L. (James Leander); University of California Libraries (1899) The captives, La Porte, Ind. : Herald Print : "The gate is covered with a terrace which is surrounded with a gilt railing in the center of which is a flag staff mounted with a gilt crescent on which the banners of the nation as well as those of the Grand Signore and Mahomet are hoisted on Fridays and festivals."
• (in English) (1836) Museum of Foreign Literature, Science and Art, E. Littell, pp. 264 : "The Dey's Palace, in 1816, was in the middle of the town, or rather lower, towards the sea. A very large crimson flag, the largest I ever saw, waved slowly and majestically over it. It was said to be composed of silk, decorated with silver stars and crescents. This may have been the case; but I could neither distinguish the materials of which it was made nor the emblems it bore."
• Cheurfi, Achour (2004) (in French) La révolution algérienne, 1954-1962: dictionnaire biographique, Casbah éditions, pp. 144 ISBN: 978-9961-64-478-2. : "In 1830, when the French invaded the country, Hussein Dey's army flew an all-red flag."

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  Red flag of Algiers in "Tabell Öfver Alla Nationers nu brukeliga Flaggor År (1805)"
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  Red flag of Algiers in "Tavola delle più esatte ed usitate Bandiere che si alberano a Bordo dei Bastimenti di Guerra, e Mercantili di tutte le Nazion (1796)"
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  Red flag of Algiers in "Tableau des principax pavillons actuellement en usage chez les puissances maritimes, et des cocardes de differens États (1826)"
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  "Flag of the Beylerbey of Algiers" in Turkish Military Naval Magazine On Algeria History Piracy Flags 1930, by ALİ HAYDAR EMİR
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  "Flag of the Beylerbey of Algiers" in Kurtoğlu, Fevzi (1987) (in Turkish) Türk bayrağı ve ay yıldız, Türk Tarih Kurumu

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Images

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Other Standards of the Regent of Algiers

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  Pavilion of the Dey of Algiers (18th - 19th century)
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  "Flag of the Beylerbey of Algiers" in Kurtoğlu, Fevzi (1987) (in Turkish) Türk bayrağı ve ay yıldız, Türk Tarih Kurumu . Used mostly as naval ensign.