13 And it
shall come to pass in that day [yowm], that the great [gadowl] trumpet [showphar] shall be
blown [taqa`], and they shall come [bow'] which were ready to perish ['abad] in the land ['erets] of
Assyria ['Ashshuwr], and the outcasts [nadach] in the land ['erets] of
Egypt [Mitsrayim], and shall worship [shachah] the LORD [Y@hovah] in the
holy [qodesh] mount [har] at Jerusalem [Y@ruwshalaim].
13 And in
that day a great trumpet will be blown, and those who were lost in the land of
Assyria and those who were driven out to the land of Egypt will come and
worship the LORD on the holy mountain at Jerusalem. ESV
Trumpets are used in a variety of ways. They are blown in order to announce something or someone important. They are blown in order to call everyone to attention. They are blown as a warning or as a signal of impending trouble, and so forth.
Here, after the Second Advent, Christ will summon all believers, and all Jews who have believed in Him, and of whom have survived the Tribulation.
Trumpets can be symbolic as to their nature of use, and they can be literal instruments that are actually blown. And in that end of days, time, they will most likely be used in both senses.
How Christ will reach around the world, or even throughout the Middle East, to call all to Him in Jerusalem, is not made clear. But that detail is not really important. Angels, for that matter, could be used to go to and fro to find and bring all to safety. Angels could easily travel about the skies and signal to everyone to come out.
But no matter.
The important thing is, that first there will be survivors. Second, there will be Jews who are among the survivors. Third, Jerusalem will survive. Fourth, Mt. Zion, often referred to as the Holy Mountain, will remain. And fifth, Christ will accomplish all of this, despite the phenomenal opposition and indifference that has and will exist throughout history.