Why do some refer to the archangel Michael as “the angel of the general resurrection”?

The archangel Michael is known as the angel of the general resurrection who will sound the trumpet to announce the second coming of Christ, when He comes to judge the living and the dead, who will rise again to be judged. St. Paul says, “For the Lord Himself will descend from heaven with a shout, with the voice of an archangel, and with the trumpet of God. And the dead in Christ will rise first” (1 Thess. 4:16). In an old veneration hymn for the archangel Michael, it says, “You are he who will sound the trumpet on the last day at the end, so that the dead may rise to be clothed in their bodies by God’s power. And then, each person will be judged according to his works before the throne of the Just Judge. We ask you O Archangel Michael to be with us on that day.”

In the Doxology of the archangel Michael, we sing: “Michael, the head of the heavenly, he is the first among the angelic ranks, serving before the Lord. God sends unto us His mercy and compassion through the supplications of Michael, the great Archangel. The harvest is perfected through the prayers of Michael for he is close to God, asking him on our behalf. All good honor and every perfect gift comes to us from on high from the Father of lights. Let us praise and glorify and worship the Holy Trinity, one in essence, who abides forever. Intercede on our behalf, O holy Archangel, Michael the head of the heavenly that He may forgive us our sins.”