Dozens are still missing. The rain has been so intent in some areas that it's overwhelmed rivers and spilled out through nearby villages and flashfloods.
Spring rains were beginning to make the Rappahannock rise. General Hooker did not want to get trapped without food and ammunition. So he ordered his men back across the river.
More than 30,000 people in the eastern German city of Halle have been asked to leave their homes as a precautionary measure after rivers reached their highest level in 400 years.