Flavius Josephus, The Wars of the Jews
William Whiston, A.M., Ed.

[437] Now this destruction that fell upon the Jews, as it was not inferior to any of the rest in itself, so did it still appear greater than it really was; and this, because not only the whole country through which they fled was filled with slaughter, and Jordan could not be passed over, by reason of the dead bodies that were in it, but because the lake Asphaltiris was also full of dead bodies, that were carried down into it by the river. And now Placidus, after this good success that he had, fell violently upon the neighboring smaller cities and villages; when he took Abila, and Julias, and Bezemoth, and all those that lay as far as the lake Asphaltitis, and put such of the deserters into each of them as he thought proper. He then put his soldiers on board the ships, and slew such as had fled to the lake, insomuch that all Perea had either surrendered themselves, or were taken by the Romans, as far as Macherus.