What does 1 Samuel 6:15 mean?

The cows took the straight way by the way to Beth Shemesh. They went along the highway, lowing as they went, and didn’t turn away to the right hand or to the left; and the lords of the Philistines went after them to the border of Beth Shemesh.

The people of Beth Shemesh were reaping their wheat harvest in the valley; and they lifted up their eyes, and saw the ark, and rejoiced to see it.

The cart came into the field of Joshua of Beth Shemesh, and stood there, where there was a great stone. Then they split the wood of the cart, and offered up the cows for a burnt offering to Yahweh.

When the five lords of the Philistines had seen it, they returned to Ekron the same day.

These are the golden tumors which the Philistines returned for a trespass offering to Yahweh: for Ashdod one, for Gaza one, for Ashkelon one, for Gath one, for Ekron one;

and the golden mice, according to the number of all the cities of the Philistines belonging to the five lords, both of fortified cities and of country villages, even to the great stone, on which they set down Yahweh’s ark. That stone remains to this day in the field of Joshua of Beth Shemesh.