Revelation 8:8-9

And the second angel sounded, and, as it were, a great mountain burning with fire That is, a great warlike nation, or hero; for in the style of poetry, which is near akin to the style of prophecy, heroes are compared to mountains; was cast into the sea: and the third part of the sea became blood; and the third part of the creatures which were in the sea died The sea, in the Hebrew language, is any collection of waters, as Daubuz observes: now, as waters are expressly made a symbol of people in this prophecy, Revelation 17:15, the waters which thou sawest are people, and nations, and tongues; the sea here may well represent the collection of many people and nations into one body politic, or empire; and when a sea is considered as an empire or a collection of people into one body, the living creatures in that sea will be the people or nations whose union constitutes this empire. And the third part of the ships were destroyed Ships, from their use in trade, are a proper representation of the riches of the people; and as they are of use in war, especially to maritime nations, they are proper emblems of strength and power. As ships were of both uses in the Roman empire, they may be well understood both of the riches and power of that empire. Thus we have a description, in this part of the second period of prophecy, of a judgment to come on the empire, in which the capital should suffer much, many provinces should be dismembered, as well as invaded, and the springs of power and riches in the empire should be very much diminished. And accordingly we find in history that this was indeed a most calamitous period. The year 400 is marked out as one of the most memorable and calamitous that had ever befallen the empire; and in the latter end of the year 406, the Alans, Vandals, and other barbarous people, passed the Rhine, and made the most furious irruption into Gaul that had yet been known; passed into Spain, and from thence over into Africa; so that the maritime provinces became a prey to them, and the riches and naval power of the empire were almost quite ruined. But the heaviest calamities fell upon Rome itself, besieged and oppressed with famine and pestilence. After Alaric and his Goths, the next ravagers were Attila and his Huns, who, for the space of fourteen years, shook the east and west with the most cruel fear, and deformed the provinces of each empire with all kinds of plundering, slaughter, and burning. They first wasted Thrace, Macedon, and Greece, putting all to fire and sword, and compelled the eastern emperor, Theodosius the second, to purchase a shameful peace. Then Attila turned his arms against the western emperor, Valentinian the third; entered Gaul with seven hundred thousand men, and, not content with taking and spoiling, set most of the cities on fire. But at length, being there vigorously opposed, he fell upon Italy, took and destroyed Aquileia, with several other cities, slaying the inhabitants, and laying the buildings in ashes, and filled all places between the Alps and the Appennines with flight, depopulation, slaughter, servitude, burning, and desperation. Such a man might properly be compared to a great mountain burning with fire, who really was, as he called himself, the scourge of God, and the terror of men, and boasted that he was sent into the world by God for this purpose, that, as the executioner of his just anger, he might fill the earth with all kinds of evils; and he bounded his cruelty and passion by nothing less than blood and burning.