Rev. 8:8  And the second angel sounded, and as it were a great mountain burning with fire was cast into the sea; (Naval conquest under Genseric, also known as Gaiseric, King of the Vandals) and the third part of the sea became blood. (Genseric's conquest affected a third of the Roman Empire.)

Sounding of the second trumpet evidently relates to the invasion and conquest of Africa, and afterward of Italy, by Gaiseric King of the Vandals.  His conquests were for the most part Naval, and his triumphs were as it were a great mountain burning with fire, cast into the sea.  What figure would better, or even so well illustrate the collision of navies, and the general havoc of war on the maritime coasts?  In explaining this trumpet, we are to look for events that will have bearing on the commercial world.  The symbol leads us to look for agitation and commotion.  Nothing but a fierce maritime warfare would fit the prediction.  If the first four trumpets are four remarkable events that contribute to the downfall of the Roman Empire, and the first refers to the ravages of the Goths under Alaric, we would then naturally look for the next succeeding act of invasion, which shook the Roman power and conduced to its fall. This next invasion was Genseric head of Vandals.  His career reached its height between years A.D. 428-468.  Genseric's headquarters was in Africa.  He resolved to create a naval power, from the port of Carthage he repeatedly made piratical sallies, preyed on the Roman commerce, and waged war on the empire. Genseric's name in the destruction of the Roman Empire deserves equal rank with the names of Alaric and Attila.