"From the earliest ages of the catholic church a Christian people, whether in time of triumph or more especially in time of crisis, has addressed prayers of petition and hymns of praise and veneration to the Queen of Heaven. And never has that hope wavered which they placed in the Mother of the Divine King, Jesus Christ; nor has that faith ever failed by which we are taught that Mary, the Virgin Mother of God, reigns with a mother's solicitude over the entire world, just as she is crowned in heavenly blessedness with the glory of a Queen. (...)

 47.  Since we are convinced, after long and serious reflection, that great good will accrue to the Church if this solidly established truth shines forth more clearly to all, like a luminous lamp raised aloft, by Our Apostolic authority We decree and establish the feast of Mary's Queenship, which is to be celebrated every year in the whole world on the 31st of May. We likewise ordain that on the same day the consecration of the human race to the Immaculate Heart of the Blessed Virgin Mary be renewed, cherishing the hope that through such consecration a new era may begin, joyous in Christian peace and in the triumph of religion.
 
   48 Let all, therefore, try to approach with greater trust the throne of grace and mercy of our Queen and Mother, and beg for strength in adversity, light in darkness, consolation in sorrow; above all let them strive to free themselves from the slavery of sin and offer an unceasing homage, filled with filial loyalty, to their Queenly Mother. Let her churches be thronged by the faithful, her feast-days honored; may the beads of the Rosary be in the hands of all; may Christians gather, in small numbers and large, to sing her praises in churches, in homes, in hospitals, in prisons. May Mary's name be held in highest reverence, a name sweeter than honey and more precious than jewels; may none utter blasphemous words, the sign of a defiled soul, against that name graced with such dignity and revered for its motherly goodness; let no one be so bold as to speak a syllable which lacks the respect due to her name. (...)

50. In some countries of the world there are people who are unjustly persecuted for professing their Christian faith and who are deprived of their divine and human rights to freedom; up till now reasonable demands and repeated protests have availed nothing to remove these evils. May the powerful Queen of creation, whose radiant glance banishes storms and tempests and brings back cloudless skies, look upon these her innocent and tormented children with eyes of mercy; may the Virgin, who is able to subdue violence beneath her foot, grant to them that they may soon enjoy the rightful freedom to practice their religion openly, so that, while serving the cause of the Gospel, they may also contribute to the strength and progress of nations by their harmonious cooperation, by the practice of extraordinary virtues which are a glowing example in the midst of bitter trials. "

Source: Pius XII, Ad Cæli Reginam - October 11, 1954

NB: Observation of the feast of Queenship of Mary was moved to August 22 by Pope Paul VI in 1969

Supplication to the Compassionate Heart of Mary for the Church

O Queen of Martyrs! Who hast, in every age, overthrown heresies, stretch forth the arm of thy power against the spirit of Satan, now unchained upon earth, and against the men of sin, who have become his agents. Behold the impious war which they do not cease to wage against Jesus Christ, thy Son, His Vicar, His Church, His Priests, and His Children. See, the ruins which they have heaped around us, the waves of blood which they have caused to flow, the countless souls which they have perverted, and cast into hell.

O! Holy Virgin, powerful Help of Christians, we entreat thee, come to our aid. Come quickly with the celestial army, especially the intrepid Archangel Michael. Kindle in all hearts, especially in the hearts of Priests, the sacred fire of most ardent zeal. Place thyself at our head, august Mother of the God of hosts, and lead us to the battle. Sustain us by thy prayers; encourage us by thine eye. Scatter before us these new infernal legions, as the wind scatters the clouds. Powerful Help of Christians, give us victory, give us triumph and peace; obtain for us a holy life and a holy death. Amen.

Who is like to God, quis ut Deus?
Who is like to Jesus, Son of God and of Mary, quis ut Jesus?
Amen.

Source: Rev. Fr. Jean Lyonnard S.J. ( Perpetual Intercession to the Agonizing Heart of Jesus, 1871)