There’s a prayer for peace attributed to Rabbi Nahman of Breslav:
Prayer for Peace
May it be Your Will, Adonai our God and God of our ancestors, to put an end to war and bloodshed on earth, and to spread a great and wonderful peace over the whole world, so that nation shall not lift up sword against nation, neither shall they learn war anymore.
May all inhabitants of this planet come to recognize and know the ultimate truth: We did not come to this world for conflict and strife, nor for hatred, envy, mockery or bloodshed; We came to this world only to know You, may You be blessed for all eternity.
Therefore, have mercy on us, and fulfill for us what is written, “And I will grant peace in the land, and you shall lie down and none shall make you afraid. I will drive the wild beasts from the land, and neither shall the sword go through your country.”*(Leviticus 26:6)
“And justice will well up like water, righteousness like a mighty stream.” (Amos 5:24).
“For the Land will be filled with knowledge (some translate: devotion to) of Adonai as water covers the sea.”( Isaiah 11:9).
May it be Your Will. And let us say: Amen.