Édouard Manet
(1832 - 1883)
The Execution of Emperor Maximilian is a series of paintings by Édouard Manet from 1867 to 1869, depicting the execution by firing squad of Emperor Maximilian I of the short-lived Second Mexican Empire. Manet produced three large oil paintings, a smaller oil sketch and a lithograph of the same subject. All five works were brought together for an exhibition in London and Mannheim in 1992–1993 and at the Museum of Modern Art in New York in 2006.
Maximilian was born in 1832, the second son of Archduke Franz Karl of Austria of the House of Habsburg and Princess Sophie of Bavaria. After a career in the Austrian Navy, he was encouraged by Napoleon III to become Emperor of Mexico following the French intervention in Mexico. Maximilian arrived in Mexico in May 1864. He faced significant opposition from forces loyal to the deposed president Benito Juárez throughout his reign, and the Empire collapsed after Napoleon withdrew French troops in 1866.
Maximilian was captured on Cerro de las Campanas in May 1867, sentenced to death at a court martial, and executed, together with Generals Miguel Miramón and Tomás Mejía, on 19 June 1867.
https://en.wikipedia.org/wiki/The_Execution_of_Emperor_Maximilian
The Execution of Emperor Maximilian of Mexico, June 19, 1867
1868
Oil on canvas
252 x 305 cm.
Kunsthalle Mannheim, Germany
https://www.bildindex.de/document/obj20283837
The link to the site of the Mannheim Kunsthalle leads to a very dark version of the painting. I haven't been to Mannheim myself so I cannot judge about the accuracy but here is a detail from the MoMA website