Wiktionary
sheathe the sword
vb. make peace
Usage examples of "sheathe the sword".
He was lying, but he had the satisfaction of seeing me sheathe the sword and hurry to see if it were so.
If you consent to pay the price of the blood which has been shed, to deliver up the booty which has been plundered, and to restore the city of Nisibis, which is in Irak, and belongs to our empire, though now in your possession, I will sheathe the sword of war.