I missed an obvious point: the Slovenians were in the middle. The multiethnic but mostly Slovene city of Gorizia became the Aleppo of WW1, blasted out of existence. One Slovenian song on the battle became almost an anthem:

http://www.hervardi.com/bitka_za_doberdob.php

Google Translate does a good job on that. There is also an Italian page on it:

https://www.antiwarsongs.org/canzone.php?id=49622

I don't really get Slavic choral singing, but it's as short and to the point as war commemoration songs get.