May 1st, 1945. Katharina_Jacob, teacher and member of the German Resistance movement against National Socialism , was rescued by Russian troops from an SS death march .

THEY ALL SANG THE INTERNATIONALE     by David Rovics
Lyrics and recordings of "They All Sang the Internationale", from Songs of Social Significance    https://www.davidrovics.com/songbook/they-all-sang-the-internationale/
Katharina Jacob from Wikipedia https://en.wikipedia.org/wiki/Katharina_Jacob