Masonry in wartime
There are many such cases. You should read 'House undivided', available from amazon.com it is the story of freemasonry during the american civil war. (or the war of yankee aggression).
In the POW camps in the civil war, the masons often sneaked food and medicine to imprisoned men. at a prison in Lake Erie, whenever a POW died, the local masonic lodge, attended to the burial, with masonic rites.
during a lull between a battle, sometimes masonic lodges met, under a flag of truce, with both Union and Confederate soldiers, meeting in lodge as brothers.