| Sinclair | John J. | | | Source: Attestation paper in WO126 |
| Sinclair | John James | 20732 | Trooper | 2nd Brabant's Horse
Source: Nominal roll in WO127 |
| Singleton | Thomas Robert | | | Source: Attestation paper in WO126 |
| Sitwell | | | Field Adjutant | 2nd Brabant's Horse
Source: Nominal roll in WO127 |
| Siversten | Louis | 20409 | Trooper | 2nd Brabant's Horse
Source: Nominal roll in WO127 |
| Sivertsen | L | | | Source: Attestation paper in WO126 |
| Skea | Richard John | | | Source: Attestation paper in WO126 |
| Skea | Richard John | 186 | Sergeant | QSA (5) CC Wep Tr Witt SA01
Source: Wepener Siege Account and Medal Roll |
| Skea | William | | | Source: Attestation paper in WO126 |
| Skea | William Hendry James | 182 | Lance Corporal | QSA (5) CC Wep Tr Witt SA01
Source: Wepener Siege Account and Medal Roll |
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