I will call - I am calling. The judgment has begun. God is summoning His hosts to the war.
Families - The various races by which the provinces of the Babylonian empire were populated.
They shall set every one his throne - The chiefs of these various races come as God’s ministers to hold solemn court, and give sentence in His name (see Jeremiah 25:9). They therefore set each one his throne in the usual place for administering justice, namely, the entering in of the gates, where a large open space was always left in cities for the purpose. Viewed in one light war is the boiling caldron of human passion, upset by hazard, and bringing only ruin in its course; in the other it is God sitting in judgment, with the kings of the earth as His assessors, solemnly pronouncing sentence upon the guilty.
Against all the walls ... - Sentence judicially pronounced, the nations come to execute judgment by mounting as enemies upon her walls and storming her cities.