Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Estimate | Name | Nat. | Ship Type | Principal victims | Where sunk | Date |
| --- | --- | --- | --- | --- | --- | --- |
| 1300–1900 | SS Sultana | US | Transport Steamboat | Union POWs formerly held by the Confederate Army | Mississippi River near Memphis | April 27, 1865 |
| 900 | HMSVictory | GB | 1st-rate | Crew | The Casquets | Oct 3, 1744 |
| 838 | HMSSt George | UK | 1st-rate | Crew | North Sea | Dec 24, 1811 |
| 800+ | Kronan | SE | 1st-rate | Crew | Baltic Sea | Jun, 1 1676 |
| 800+ | HMSRoyal George | GB | 1st-rate | Crew | Spithead | Aug 29, 1782 |
| 800 | HMSAssociation | GB | 2nd-rate | Crew | Isles of Scilly | Oct 22, 1707 |
| 699 | HMS Ramilles | GB | 3rd-rate | Crew | Bolt Head | Feb 15, 1760 |
| 673 | HMSQueen Charlotte | GB | 1st-rate | Crew | Livorno | Mar 17, 1800 |
| 566 | General Lyon | US | Transport | Discharged Union soldiers, Confederate s POW | Cape Hatteras | Mar 31, 1865 |
| 600 | HMSHero | UK | 3rd-rate | Crew | Wadden Sea | Dec 28, 1811 |
| 555 | HMSDefence | UK | 3rd-rate | Crew | North Sea | Dec 24, 1811 |
| 380 | Mary Rose | Eng | Carrack | Soldiers, crew | The Solent | Jul 19, 1545 |
| 372 | Arniston | Eng | East Indiaman | Soldiers, crew & their family | Cape Agulhas | May 30, 1815 |
Question:
Who were the victims of the US ship that sank in the Mississippi River near Memphis?
Answer:
Union POWs formerly held by the Confederate Army