The Third Amendment of the United States Constitution forbids any soldier from forcing a home-owner to provide him shelter and food without consent. It's original text goes as follows "No Soldier shall, in time of peace be quartered in any house, without the consent of the Owner, nor in time of war, but in a manner to be prescribed by law."
The amendment was an obvious reaction to forced quarterings by the British Army during colonial days. Lt. General Thomas Gage had found it hard to persuade colonial groups to provide food and shelter for British soldiers, so parliament had passed bills forcing them to do so.
The 3rd Amendment is one of the least cited parts of the U.S. Constitution. Mainly because any attempts to contradict the amendment haven't occurred since the American Revolution. The only major court case to use the 3rd amendment as a major defense was Engblom v. Carey where New York correction officers had gone on strike. National Guard troops were sent in their place for the interim, and the housing used for the officers were taken by the National Guard troops. A federal court ruled that the action did indeed infringe upon their 3rd amendment rights.