Angels
(1 Pet 3:22) are closest to all to people. They proclaim the intent of God, guiding people to virtuous and holy life. They protect believers restraining them from falling, and they raise up the fallen; never do they abandon us and always they are prepared to help us, if we so desire.
All the Ranks of the Heavenly Powers have in common the name Angels -- by virtue of their service. The Lord reveals His will to the highest of the Angels, and they in turn inform the others.
Over all the Nine Ranks, the Lord put the Holy Leader Michael (his name in translation from the Hebrew means "who is like unto God") -- a faithful servitor of God, wherein he hurled down from Heaven the arrogantly proud day-star Lucifer together with the other fallen spirits. And to the remaining Angelic powers he cried out: "Let us attend! Let us stand aright before our Creator and not ponder that which is displeasing unto God!" According to Church tradition, in the church service to the Archistrategos Michael concerning him, he participated in many other Old Testament events. During the time of the Exodus of the Israelites from Egypt he went before them in the form of a pillar of cloud by day and a pillar of fire by night. Through him the power of the Lord was made manifest, annihilating the Egyptians and Pharaoh who were in pursuit of the Israelites. The Archangel Michael defended Israel in all its misfortunes.

Attendants at God's throne
It is as messengers that they most often figure in the Bible, but, as St. Augustine, and after him St. Gregory, expresses it: angel is the name of the office and expresses neither their essential nature nor their essential function, that of attendants upon God's throne in that court of heaven of which Daniel has left us a vivid picture:
I behold till thrones were placed, and the Ancient of Days sat: His garment was white as snow, and the hair of His head like clean wool: His throne like flames of fire: the wheels of it like a burning fire. A swift stream of fire issued forth from before Him: thousands of thousands ministered to Him, and ten thousand times a hundred thousand stood before Him: the judgment sat and the books were opened. (Daniel 7:9-10; cf. also Psalm 96:7; Psalm 102:20; Isaiah 6, etc.)
This function of the angelic host is expressed by the word "assistance" (Job, I, 6: ii, 1), and our Lord refers to it as their perpetual occupation (Matt., xviii, 10). More than once we are told of seven angels whose special function it is thus to "stand before God's throne" (Tob., xii, 15; Apoc., viii, 2-5). The same thought may be intended by "the angel of His presence" (Is., lxiii, 9)

LITANY OF THE HOLY ARCHANGELS ST. MICHAEL, ST. GABRIEL
Lord, have mercy on us!
Christ, have mercy on us!
Lord, have mercy on us! Christ, hear us!
Christ, graciously hear us!
God, the Father of Heaven, Creator of every spirit, have mercy on us!
God, the Son, Redeemer of the world, on whom the angels desire to gaze, have mercy on us!
God, the Holy Spirit, felicity of the blessed spirits, have mercy on us!
Holy Trinity, one God, glory of the holy angels,
have mercy on us!
Holy Mary, Queen of the heavenly spirits,
pray for us!
St Michael, prince of the celestial host,
pray for us!
Chief of the angels of peace, etc….
Most strong in combat,
Conqueror of the ancient serpent,
Defender at all times of the people of God,
Who did expel Lucifer and his confederates
from Heaven,
Who receives souls at their departure, and
conducts them to Paradise,
Solace of the faithful,
Protector of those who are devout to you,
St Gabriel, who revealed to Daniel divine secrets,
Who declared the birth and ministry of
St John the Baptist,
Who announced the Incarnation of the Word,
Guardian of the Holy Virgin,
Attendant of the infancy of the Saviour,
Who consoled Christ in his last agony,
Faithful minister of Christ,
St Raphael, angel of health,
St Raphael, one of the seven spirits who stand before the Throne,
Faithful conductor of Tobias,
Who did compel the devil to flee,
Offerer of our prayer before the Lord,
Curer of blindness,
Helper in tribulation,
Consoler in necessities,
Making joyful your devoted clients,
Holy Michael, Gabriel
Christ Jesus, beatitude of the angels, spare us!
Christ Jesus, glory of the heavenly spirits, hear us!
Christ Jesus, splendor of the celestial armies, have mercy on us!
TO ST. MICHAEL:
O God, who did render blessed Michael, your archangel, victorious over the proud Lucifer and the wicked spirits, we beseech you that combating under the Cross, and ever adopting his maxim ‘Who is like God?’ we may be victorious over all our enemies, and delivered from all impediments; regulate our lives according to your will and commandments. Through Jesus Christ, our Lord. Amen.
TO ST. GABRIEL:
O God, the lover of the salvation of mankind, who did commission blessed Gabriel, assisting before your throne, to announce to the ever glorious Virgin, the mystery of your blessed Son’s becoming man, we beseech you, that recurring to his intercession, we may be helped in all our wants, spiritual and temporal. Through Jesus Christ, our Lord. Amen.