Adam Clarke on Isaiah 27:13

The great trumpet shall be blown - Does not this refer to the time spoken of by our Lord, Mat 24:31 : He shall send forth his angels - the preachers of his Gospel with a great sound of a trumpet - the earnest invitation to be saved by Jesus Christ; and shall gather his elect - the Jews, his ancient chosen people, from the four winds - from all parts of the habitable globe in which they have been dispersed.

In this prophet there are several predictions relative to the conversion of Egypt to the true faith, which have not yet been fulfilled, and which must be fulfilled, for the truth of God cannot fail. Should Egypt ever succeed in casting off the Ottoman yoke, and fully establish its independence, it is most likely that the Gospel of Christ would have a speedy entrance into it; and, according to these prophecies, a wide and permanent diffusion. At present the Mohammedan power is a genuine antichrist. This also the Lord will remove in due time.