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This map was published in an article published in 1908 in the Royal Geographical Society C. M. Church and J. L. Myres, titled "A Contribution to the Topography of the North-Western Greece.
The article describes "The passage of the Greek squadron under the batteries of Preveza 'secured to the Greeks the command of the Gulf of Arta. The town of Vonitsa, a ruinous spot, was occupied by the Greek troops on December 27, 1828, but the almost defenseless Venetian castle did not capitulate until March 17, 1829. The passes of Makrynoros were occupied in April.'" (this last passage was quoted from the "History of Greece" (ed. Tozer, Oxford, 1877), vol. 7, p. 39)
"This took place in October, 1828, This action gave the Greeks possession of the Gulf of Arta. The occupation of the thread of land from Salaghora to Koronisi was the next in a series of operations."