For those with little background on who the Mackenzie-Papineau battalion were, you might be interested in this series of newspaper articles from the Daily Clarion in Toronto in 1937. Ted Allan ("This Time a Better Earth) wrote these first hand reports from Spain.

https://drive.google.com/file/d/1onpdhGxNxTffujPl_uA_fZpDMvjNPTP5/view?usp=drive_link