I recently read about two Armenians who saved the populations of two Bulgarian towns from the Ottoman troops in the 1870s.

Hovhannes Svajyan - a military telegraphist at the Tatar Pazardzhik station.
In January 1878, upon his withdrawal from Tatar Pazardzhik, Ottoman commander Suleiman Pasha requests permission from the Sultan and the High Porte to organize a massacre and burn the city. 1/3

The Turkish government gives Suleiman a positive answer, but Svajyan changes the text of the telegram and decrypts it in the opposite sense into the hands of Pasha who does not understand the Morse code, and thus saves the Bulgarian population. 2/3

In 2006 a monument was unveiled in his honor:
"...rescued the Bulgarian population in Pazardzhik during the Russo-Turkish War of Liberation. Winner of the three degrees of the Order of Civil Merit and St. Alexander. First interim mayor and honorary citizen of Pazardzhik." 3/3

Eranos Eranosyan - head of the military telegraph in Balchik.
Learning about the massacres of Bulgarians and the arson in Kavarna, carried out by the bashibozuks, he secretly sends telegrams to consuls in Varna and to Europ. diplomats in Constantinople with a call for help. 1/4

His telegram says:
"July 21st. At this moment, they are killing Christians in Kavarna, which is half an hour from Balchik. If no human assistance comes tomorrow, everything will be over. Make this telegram accessible to all ambassadors. " 2/4