| Brennan | Michael | 45020 | Trooper | No known Company. Served in 36th Btn IY
Source: QSA Medal Rolls | Imperial Yeomanry |
| Brennan | Michael | 2064 | Private | Source: OZ-Boer database | Tasmania, 3rd Battalion Australian Commonwealth Ho |
| Brennan | Michael | | | 2nd Battalion
Source: QSA and KSA medal rolls | Royal Inniskilling Fusiliers |
| Brennan | Michael John | 224 | Private | Source: OZ-Boer database | Queensland, 6th Imperial Bushmen Contingent |
| Brennan | Mortimer Bert | 125 | Private | Source: OZ-Boer database | South Australia, 8th Battalion Australian Commonwe |
| Brennan | O | 2101 | Private | Frontier Wars. SAGS (1) 1879 | Royal Warwickshire Regiment |
| Brennan | P | | | 1st Battalion
Source: QSA and KSA medal rolls | Royal Dublin Fusiliers |
| Brennan | P | | | 2nd Battalion
Source: QSA and KSA medal rolls | Royal Dublin Fusiliers |
| Brennan | P | 2040 | Private | 1st Battalion
Demise: Killed accidentally on railway 12 Jan 1902
Place: Schoombie Cape
Source: In Memoriam by S Watt | Coldstream Guards |
| Brennan | P | | | Source: QSA and KSA rolls | British South Africa Police |
| Brennan | P | | | 2nd Battalion
Source: QSA and KSA medal rolls | South Wales Borderers |
| Brennan | P | | | 1st Battalion
Source: QSA and KSA medal rolls | Royal Irish Regiment |
| Brennan | P | 6362 | Private | 2nd Btn. Killed at Alleman's Nek. 11 Jun 1900.
Source: Natal Field Force Casualty Roll, page 187 line 55 | Royal Dublin Fusiliers |
| Brennan | P | 18685 | Gunner | Demise: Died of injuries - accident 24 Feb 1901
Place: Elandsfontein
Source: In Memoriam by S Watt | 61st Battery, RFA |
| Brennan | P | 6362 | Private | 1st Battalion
Demise: Killed in action 11 Jun 1900
Place: Allemans Nek
Source: In Memoriam by S Watt | Royal Dublin Fusiliers |
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