Nicaragua was under a radical left-wing regime in the 1980s. Mother Teresa, now Saint Teresa of Calcutta, was planning to open a house for her Sisters there despite the fact that relations between the state and the Church were especially tense.
One day, she and a few sisters were having a picnic after a Mass at a site of apparitions in that country when a hundred armed soldiers arrived and approached the group. Instead of panicking, Mother Teresa walked up to the soldiers and took a Miraculous Medal (the famous medal the Virgin gave to Saint Catherine Labouré) out of her bag for each of the soldiers.
A few days later, she received permission to send her Sisters to Nicaragua!