Back in the day when a gentleman was a gentleman.
Hard to believe now, when even the President of the United States routinely lies his *ss off.
May I suggest “Panzer Commander” by Major Hans von Luck?
in it, Major von Luck discusses desert warfare in North Africa, where it was English vs Italians (then Germans) vs Arab nomads; if the nomads caught you out in the desert, they would kill you and strip your corpse of weapons and valuables.
Therefore the Axis and Allied forces arranged a truce that ran nightly from sunset to sunrise; if opposing forces were caught out in the desert at night they were returned to their own lines.
Hostilities resumed at dawn...