The book of Judges starts out with Judah finishing the job of conquering the promised land and wiping out its current inhabitants. At first, all goes well (“When Judah attacked, the LORD gave the Canaanites and Perizzites into their hands, and they struck down ten thousand men at Bezek.”).
But then (Judges 1:19):
19 The LORD was with the men of Judah. They took possession of the hill country, but they were unable to drive the people from the plains, because they had chariots fitted with iron.
Stupid iron chariots, with their stupid stronger-than-God-ness! They’re always foiling God’s plans!
Maybe this is why we don’t see miracles like the parting of the Red Sea or the sun standing still anymore: there are too many iron chariots around, in the form of cars and trucks, so God can’t do his stuff anymore.