| 1 | This follows the arrival of the expansion of serfdom. | |
| 2 | Peter had a virtually inexhaustible supply of serfs. | |
| 3 | The serfs were liberated after abolishing serfdom. | |
| 4 | Feudalism, landed nobles, and serfdom were born. | |
| 5 | In the uprising the serfs fought with bare hands against gunfire. |