"Mahutny Boža" is a famous Belarusian hymn, based on a poem by Natallia Arsiennieva and music by Mikola Ravienski. It was translated into English by Vera Rich.
The tombstone on Mikola Ravienski's grave in Leuven, Belgium with the sheet music of Mahutny Boža engraved
The "Warrior March", also known by its incipit "Come, We Shall March in Joint Endeavour", was the national anthem of the short-lived Belarusian Democratic Republic that existed from 1918 to 1919.
Original sheet music of the anthem, 1919.