Catechism of the Catholic Church §2327 — excerpt
Because of the evils and injustices that all war brings with it, we must do everything reasonably possible to avoid it. the Church prays: "From famine, pestilence, and war, O Lord, deliver us."
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.