They were fairly well organised for armies in their time with a professional core of soldiers, supplemented by levies in time of need, but those numbers are fiction.Setzer wrote: Did the Assyrians ever assemble a force of 185,000 in one place? I mean, outside of official propaganda? I could see the Persians or the Romans managing it, but I don't think the Assyrians had that kind of population or logistics.
It's estimated that the whole Assyrian armed forces were maybe 200,000 soldiers, with an maximum army size of around 50-70,000. There are stone tables which lists the food transports going to the armies and based on the daily rations assigned to a soldier they managed to extrapolate the estimated size. This includes all the support staff and non-combatants travelling with the army, so the actual fighting numbers would be lower.
Pretty much all army sizes mentioned in the old testament suffer from serious over-inflation. And that's being euphemistic.