And when all the Moabites heard that the kings had come up to fight against them, all who were able to bear arms and older were gathered; and they stood at the border.
2 Kings 3:21
Surrounding context
3:20 Now it happened in the morning, when the grain offering was offered, that suddenly water came by way of Edom, and the land was filled with water.
3:21 And when all the Moabites heard that the kings had come up to fight against them, all who were able to bear arms and older were gathered; and they stood at the border.
3:22 Then they rose up early in the morning, and the sun was shining on the water; and the Moabites saw the water on the other side as red as blood.