| Caldwell | W | | | Source: QSA and KSA medal rolls | New Zealand, 5th Contingent (Imperial Bushmen) |
| Caldwell | W | 111 | Trooper | 2nd Brabant's Horse
Source: Nominal roll in WO127 | Brabant's Horse |
| Caldwell | W | | | 2nd Battalion
Source: Medal rolls | Cheshire Regiment |
| Caldwell | W | | 3rd Engineer | Transport Medal, clasp: South Africa. Ship: Canning (Lamport & Holt).
Source: Transport Medal roll | Transport ships |
| Caldwell | W | | Trooper | BSACM Rhodesia 1896 (0).
Source: BSACM rolls | British South Africa Police |
| Caldwell | W | | | 2nd Battalion
Source: QSA and KSA medal rolls | Royal Irish Rifles |
| Caldwell | W | | | Source: WO100/280 | Alice TG |
| Caldwell | W | | | 2nd Battalion
Source: QSA and KSA medal rolls | Cheshire Regiment |
| Caldwell | W | 2226 | Trooper | Died of disease. Pretoria, 13 December 1900
Source: South African Field Force Casualty Roll | New Zealand contingent |
| Caldwell | W | 4590 | Corporal | Prisoner. Stormberg, 10 December 1899
2nd Battalion.
Source: South African Field Force Casualty Roll | Royal Irish Rifles |
| Caldwell | W | 3513 | Shoeing Smith | Slightly wounded. Ventersdorp, 9 January 1901
Source: South African Field Force Casualty Roll | 14th (The King's) Hussars |
| Caldwell | William | 22515 | Trooper | Source: QSA Medal Rolls | 17th Company, 6th Btn, IY |
| Caldwell | William | 2222 | Trooper | Source: OZ-Boer database | New South Wales, 3rd Contingent NSW Imperial Bushm |
| Caldwell | William | 37528 | Trooper | 1st Battalion
Source: QSA Medal Rolls | Scottish Horse |
| Caldwell | William | 29524 | Private | Source: QSA Medal Rolls | 100th Company, 5th Btn, IY |
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