November 1915 The peak of the Glasgow Rent Strikes led by Mary Barbour.
1915 Glasgow Rent Strikes , article from Wikipedia     https://en.wikipedia.org/wiki/1915_Glasgow_rent_strikes
Mary Barbour , article from Wikipedia     https://en.wikipedia.org/wiki/Mary_Barbour

MRS BARBOUR’S ARMY  Recordings on YouTube from Alistair Hulett, The Bog Standards, The Sandpipers, EIS Choir, Karine Polwart & Siobhan Miller, Govan Allsorts Choir and others       https://www.youtube.com/results?search_query=+Mrs+Barbour%27s+Army