Yes, I’m still on Philippine-American War mode (and #Mabini150 mode too). :) This is one interesting print in the Library of Congress. The Filipino forces is seen carrying the Philippine flag of the Republic. But the flag was incorrectly portrayed: the sun is not anthropomorphic, and, at war, the red side should have been on top.
Another interesting thing to note on the print, was the sky blue hue of the blue side of the flag. This is in fact a raging debate among historians.
Historian Ambeth Ocampo explains:
In 1955, the Heraldry Commission issued the official specification for the Philippine flag. The shade of blue given was United States Cable 70077, or navy blue. Earlier, all flags had been using navy blue.
However, the late Domingo Abella, the Director of the National Archives and a member of the NHI [National Historical Institute] believed that the shade of blue should be light blue, because he says that at the turn of the century when the Philippine flag was finally allowed to fly and be displayed after years of suppression, flag makers didn’t have a supply of light blue cloth. Thus, they used dark-blue cloth instead, perpetuating the mistake.
No documentary evidence was presented by Abella and so, he was not taken seriously till the late Teodoro A. Agoncillo also supported the camp battling for the light-blue flag. E. Aguilar Cruz, another member of the NHI stated in his monograph of [Philippine revolutionary and artist] Juan Luna that he found a watercolor by Luna which showed a Philippine flag with a light-blue field. [Aguinaldo’s first Prime Minister] Apolinario Mabini in one of his letters even proposed that the blue in the flag of the Revolution be “azul celeste”, or sky blue. The navy-blue camp is supported by all extant flags having this color, plus the testimony of Marcela Agoncillo, the only surviving daughter of Marcela Agoncillo, who made the original flag which Aguinaldo waved to the crowd outside his mansion in Cavite when he declared Philippine Independence.
However, both sides may be wrong, because in a letter to [sympathizer of the Filipino cause and friend of Jose Rizal] Ferdinand Blumentritt in 1898 [Filipino revolutionary] Mariano Ponce sent a drawing of the Philippine flag which showed that the blue is “azul oscuro” which is in between “azul celeste” (sky blue or light blue) and “azul marino” (navy or dark blue). So the blue in the flag is not sky blue but a shade lighter than the present navy blue. This caused confusion among the people. Someone mistook “lighter than the present blue” to mean sky blue, which is wrong. The issue would have ended here had Ponce kept quiet because in 1899, in one of the few letters he wrote in English, he told a Mr. Y. Fukishama, “My dear sir, I am sending you, by parcel post, one scarf pin representing our flag: please accept it as a poor souvenir. The blue color of the sky means our hope in future prosperity through progress…”
Noted historian Carmen Guerrero Nakpil asserts that the original color was “Cuban blue”, although this assertion is itself subject to different interpretations since there isn’t an official shade for the color blue in the Cuban flag.
This raging debate on the blue hue of the flag was finally resolved in 1998, when the government chose royal blue instead of American navy blue, Cuban blue or Pale sky blue.
"Battle of Paceo. (Manila) Feb’y 4’ & 5’ 1899. Am. Loss: Kill’d 22, W’d 145, Philip’s Over 1000," Library of Congress Prints and Photographs Division.