John 11:35 of the New Testament is one of the shortest verses of scripture: “Jesus wept.” The scene was one where his dear friend, Lazarus, had died. Two days earlier, word had come to him from the town of Bethany where Lazarus and his sisters--Mary and Martha-lived, that Lazarus was on the verge of death, but for much of that time, Jesus pretended to no urgency to go to minister to Lazarus.
It's not necessary to know all of the place names in Isaiah 20 and where they are on a map, although like the last pieces of a finished puzzle, it certainly makes the picture more clear that Isaiah is describing. What is most important to know about Isaiah 20 is that God is infinitely stronger than any of the kingdoms of the earth. Isaiah 20 illustrates an example of this by showing the historical sweep of the king of Assyria and his armies hundreds of miles from the north down toward Jerusalem where, after having made a systematic progress of destruction for most of that distance, he is stopped in his tracks just short of Jerusalem.