Has a call for restraint from an authority figure ever put a stop to war?

. UK edition

A pair of hands with
Hands up for peace. Photograph: Paulina Patimer/Zuma Press Wire/Shutterstock

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts

Has a war ever ended or de-escalated because someone (eg the pope, the UN secretary general) called on the belligerents to “show restraint”?
Laurence Whiteside, via email

Post your answers (and new questions) below or send them to nq@theguardian.com. A selection will be published next Sunday.