| 1 | The place chosen was situated on the Potomac River. | |
| 2 | Once again, he had forced back the Army of the Potomac. | |
| 3 | Across an expanse of the Potomac floodplain, airplanes were landing at National Airport. | |
| 4 | The road is about one hundred forty kilometers from Washington, on the other side of the Potomac River. | |
| 5 | A town of northwest Virginia on the Potomac River south-southwest of Alexandria. A U. S. Marine Corps base was established here in 1918. Population, 621. |