Not strictly aviation but may be resonant with today's news:
My Military Law/ Geneva Convention detailed knowledge stops at 1918, the year when my library and interests stop.
However, changes since then seem superficial, and in those days having or bearing arms in a hospital [even temporary sanctuary such as a Nunnery] rendered the culprits fair game for summary execution, rather than regarded as surrendering, and thus P o W.
Not that Palestine is officially a war.