The Prayer to St. Michael the Archangel, Anima Christi, Breastplate of St. Patrick and Psalm 91 are examples of spiritual warfare prayers. In addition, there are more specialized prayers that the Catholic Church gives priests to say when performing an exorcism over an individual believed to be demonically possessed.
The Prayer to St. Michael makes a specific request that the archangel defend the one saying the prayer against the temptations of the devil, and that he cast Satan and his demons back into Hell. Pope Leo XIII officially instituted the prayer for the entire Catholic Church in the late nineteenth century, and for some time after that it was commonly prayed after Low Masses.
Psalm 91 is a prayer of trust in God amidst attack from evil. The Anima Christi is an invocation of the body, blood and passion of Jesus Christ as a defense against the devil's attacks, especially at the hour of death. The Breastplate of St. Patrick is a lengthy prayer against evil using military imagery.
The Roman Catholic Church takes demonic possession seriously, and so institutes specialized priests and prayers to deliver individuals who are thought to be under Satan's power. These prayers include the Litany of the Saints and Psalm 53.