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Painting
https://en.wikipedia.org/wiki/Russian_Orthodox_Church#/media/File:Miloradovichdefense.jpg for a painting
Wiki Article - Siege of Troitse-Sergiyeva Lavra
https://en.wikipedia.org/wiki/Siege_of_Troitse-Sergiyeva_Lavra
My guess is the monks can probably be added to Russian units rather than forming "Monk" units.