Question Two of Chapter Nine of the Second Decade
Whether the conflict of the angels with the dragon was real and corporeal
It is asked whether the conflict of the angels about which it is written in Revelation, chapter 12, that Michael fought with the dragon, and so forth, was real and corporeal or intentional and mental.
To this it is answered that it was real, but not corporeal.
For the understanding of this, it must be known that in us, besides the kinds of wars which pertain to exterior executive power, we also experience certain kinds of wars pertaining to certain immanent and interior operations.
The first, namely, is between the sensitive and intellective appetites, for those two appetites are inclined toward opposites. For the flesh desires against the spirit, and conversely.
The second conflict is between the intellect and the will, as when reason judges that something ought to be done and the will refuses.
The third is between the will and the will of different persons, not of one person toward himself.
The fourth is between intellect and intellect, from contrary opinions through opposed reasons.
Therefore, the war of the angels, according to the foregoing, was threefold, corresponding to the three things which are found in their intellectual nature, namely reason, will, and faculty.
For through reason the elect and the reprobate thought contrary things.
Through will they were affected toward contrary things.
Through faculty, however, they strove toward opposed things.
For the elect angels thought submissively concerning God, grace, and his glory, and were affected toward and strove after those things. The evil angels did the contrary.
And thus one must also understand the altercation of Michael with the devil concerning the finding of the body of Moses, about which it is written in the Epistle of Jude, chapter 1, and in cause 24, question 3, chapter Si igitur.
These things are from Francis of Meyronnes upon Book II of the Sentences, distinction 6.
Addition
If you desire more, see Raphael Maffei in his exposition of the Canonical Epistle of Saint Jude the Apostle.