Whenever Catholics are confronted with war, one of the primary weapons to be drawn is the Rosary, imploring heavenly aid for a swift return to peace.
Many saints, such as St. Padre Pio, recall the power of the Rosary for peace.
History is also full of examples of Catholics uniting together to pray the Rosary for Peace. The Handbook of the National Catholic War Council in 1918 points out a few examples.
St. John Paul II also specifically highlighted this aspect of the Rosary in his encyclical Rosarium Virginis Mariae.
In times of war and violence, the Church urges everyone to increase their prayer, specifically praying the Rosary for peace in the world.