What does Joshua 10:9 mean?

The men of Gibeon sent to Joshua at the camp at Gilgal, saying, “Don’t abandon your servants! Come up to us quickly and save us! Help us; for all the kings of the Amorites that dwell in the hill country have gathered together against us.”

So Joshua went up from Gilgal, he, and the whole army with him, including all the mighty men of valor.

Yahweh said to Joshua, “Don’t fear them, for I have delivered them into your hands. Not a man of them will stand before you.”

Yahweh confused them before Israel. He killed them with a great slaughter at Gibeon, and chased them by the way of the ascent of Beth Horon, and struck them to Azekah and to Makkedah.

As they fled from before Israel, while they were at the descent of Beth Horon, Yahweh hurled down great stones from the sky on them to Azekah, and they died. There were more who died from the hailstones than those whom the children of Israel killed with the sword.

Then Joshua spoke to Yahweh in the day when Yahweh delivered up the Amorites before the children of Israel. He said in the sight of Israel, “Sun, stand still on Gibeon! You, moon, stop in the valley of Aijalon!”