The six-winged SERAPHIM (Flaming, Fiery) (Is 6:12) stand closest of all to the Most Holy Trinity. They blaze with love for God and kindle such love in others.
The many-eyed CHERUBIM (outpouring of wisdom, enlightenment) (Gen 3:24) stand before the Lord after the Seraphim. They are radiant with the light of knowledge of God, and knowledge of the mysteries of God. Through them wisdom is poured forth, and people's minds are enlightened so they may know God and behold His glory.
Over all the Nine Ranks, the Lord appointed the Holy Archangel Michael (his name in Hebrew means "who is like unto God"), the faithful servitor of God, as Chief Commander. He cast down from Heaven the arrogantly proud Lucifer and the other fallen spirits when they rebelled against God. Michael summoned the ranks of angels and cried out, "Let us attend! Let us stand aright before our Creator and do not consider doing what is displeasing unto God!"
During 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.
Troparion - Tone 4
Kontakion - Tone 2
You said in the Scriptures, immortal Lover of humanity, that in heaven multitudes of Angels rejoice over one human being who repents. Therefore, O Sinless One, who alone know the heart, we in our lawlessness dare each day to implore You, the compassionate, to take pity on us, Master, and send us compunction, though we are unworthy, and pardon our sins, at the intercession for us all, of the Chief Captains of the Bodiless Hosts.
(taken from: http://sgpm.goarch.org/ematins/bilingual/Nov08.pdf)