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St Michael is a warrior archangel. Love and truth are the weapons. I don’t know of any deeper significance, but would very much like to, if anybody knows.

Short Prayer to St. Michael the Archangel
The well-known short version of this prayer follows in English and Latin. The Pope (Leo XIII ?) ordered this prayer to be recited daily after Low Mass in all the churches throughout the Catholic world. However this practice was almost completely swept away in the 1960s by liturgical changes made in the wake of Vatican Council II.
“Saint Michael the Archangel, defend us in battle, be our protection against the malice and snares of the devil. May God rebuke him we humbly pray; and do thou, O Prince of the Heavenly host, by the power of God, thrust into hell Satan and all evil spirits who wander through the world for the ruin of souls. Amen.
Sáncte Míchael Archángele, defénde nos in proélio, cóntra nequítiam et insídias diáboli ésto præsídium. Ímperet ílli Déus, súpplices deprecámur: tuque, prínceps milítiæ cæléstis, Sátanam aliósque spíritus malígnos, qui ad perditiónem animárum pervagántur in múndo, divína virtúte, in inférnum detrúde. Ámen
I imagine the Pope had his reasons for wanting the prayer to be prayed daily. It seems strange however that when the Church was liberalized the martial aspect of prayer was deliberately diminished.