I was under the impression that it was Judah who had problems with 'iron chariots' not so much God. Judges 1:19
The Lord was with Judah, and [Judah] drove out the inhabitants of the hill country, but he could not drive out those inhabiting the [difficult] valley basin because they had chariots of iron.
The intended subject of drove
is irrelevant; even if we accept that it refers to Judah, it still implies a restriction on God's powers, because God was 'with' Judah during the battle - yet Judah did not prevail.
Some translations of the Bible acknowledge this by pluralizing the subject e.g. the NIV: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
(Off-topic, but I don't understand what Judah is doing in Judges. He was one of the sons of Jacob; it was he who suggested selling Joseph into slavery, and then followed him to Egypt with Jacob and the rest of the Israelites.
So he apparently outlived his brother Joseph, waited for Moses to be born, grow up and lead the Exodus, and then survived 40 years in the wilderness, and then served under Joshua during the entry into the Promised Land, and then took over after Joshua's death - the beginning of Judges.
This in spite of the fact that Exodus 1 clearly states that Joseph and all his brothers died before the birth of Moses: 1 These are the names of the sons of Israel who went to Egypt with Jacob, each with his family: 2 Reuben, Simeon, Levi and Judah; 3 Issachar, Zebulun and Benjamin; 4 Dan and Naphtali; Gad and Asher. 5 The descendants of Jacob numbered seventy[a] in all; Joseph was already in Egypt.
6 Now Joseph and all his brothers and all that generation died, 7 but the Israelites were exceedingly fruitful; they multiplied greatly, increased in numbers and became so numerous that the land was filled with them.
And in spite of the fact that God specifically said that all the adult Israelis would die in the forty years in the wilderness, except for Joshua and Caleb. Numbers 14:28 So tell them, ‘As surely as I live, declares the LORD, I will do to you the very thing I heard you say: 29 In this wilderness your bodies will fall—every one of you twenty years old or more who was counted in the census and who has grumbled against me. 30 Not one of you will enter the land I swore with uplifted hand to make your home, except Caleb son of Jephunneh and Joshua son of Nun.
So, what is Judah doing in Judges, after the death of Joshua?).