The following list of those killed during WW1 is taken from the excellent West Wales War Memorial site. I shall try to expand where I can if more information is uncovered about each individual. All served at some point with the Pembroke Yeomanry, many later forming part of 24 Welsh Regiment, and some transferring, or being posted as Battlefield Casualty Replacements, to other regiments.
| Rank | Name | Battalion |
| Sapper | Bennett, Thomas Lewis | Royal Engineers- 174th Tunneling Coy |
| Private | Bevan, H L | Pembroke Yeomanry |
| Private | Branfield, Sydney Ernest | Welsh Regiment- 24th Battalion |
| Corporal | Brown, Hubert Reginald | Pembroke Yeomanry |
| Private | Byron, William | Pembroke Yeomanry |
| Private | Casey, William | Hampshire Regiment- 1st Battalion |
| Lieutenant | Clemetson, David Louis | Pembroke Yeomanry |
| Private | Cole, Thomas George | CheshireRegiment- 11th Battalion |
| Lance Corporal | Cole, Victor James, MSM. | Royal Engineers- Railways |
| Private | Cook, Thomas | Welsh Regiment- 24th Battalion |
| Private | Corbett, William George | Royal Welsh Fusiliers- 16th Battalion |
| Private | Cosgrove, J | Pembroke Yeomanry |
| Lance Corporal | Cox, Harry Percival | Pembroke Yeomanry |
| Private | Davies, John Cynfyn | Royal Welsh Fusiliers- 16th Battalion |
| CQMS | Davies, John Jenkin | Welsh Regiment- 24th Battalion |
| Corporal | Davies, Robert Thomas | Pembroke Yeomanry |
| Private | Davies, Samuel | Pembroke Yeomanry |
| Lance Corporal | Davies, Thomas | Royal Welsh Fusiliers- 16th Battalion |
| Serjeant | Davies, Watkin Jones | Welsh Regiment- 24th Battalion |
| Private | Davies, William | Welsh Regiment- 24th Battalion |
| Private | Dawson, David John | Welsh Regiment- 24th Battalion |
| Lieutenant | De Rutzen, Baron Alan Frederick James | Pembroke Yeomanry |
| Corporal | Evans, David | Royal Welsh Fusiliers- 16th Battalion |
| C.Q.M.S. | Evans, Evan Charles | Welsh Regiment- 24th Battalion |
| Private | Evans, Henry | Royal Welsh Fusiliers- 16th Battalion |
| Private | Evans, Reginald Charles Wilfred | Royal Welsh Fusiliers- 2nd Battalion |
| Serjeant | Evans, William | Welsh Regiment- 24th Battalion |
| Trooper | Foxwell, Thomas W. | Pembroke Yeomanry-1/1st Battalion |
| Private | George, Hubert Thomas | Welsh Regiment- 24th Battalion |
| Private | Glanville, Hugh Slader | Welsh Regiment- 24th Battalion |
| Corporal | Griffiths, David George | Welsh Regiment- 24th Battalion |
| Private | Griffiths, Evan | Welsh Regiment- 24th Battalion |
| Private | Guilfoyle, Francis Arthur De Montmerenzie | Pembroke Yeomanry |
| Private | Hall, Frederick Charles | LancashireFusiliers- 2nd Battalion |
| Corporal | Hallam, Edward Douglas Maine | Pembroke Yeomanry-2/1st Battalion |
| Private | Hamer, William Charles | Royal Welsh Fusiliers- 16th Battalion |
| Private | Harries, John Clarke | Welsh Regiment- 24th Battalion |
| Lance Corporal | Harries, Seth John | Welsh Regiment- 24th Battalion |
| Private | Harrington, Henry | Welsh Regiment- 24th Battalion |
| Major | Higgon, John Arthur | Pembroke Yeomanry |
| Captain | Hoare, Reginald Arthur | Pembroke Yeomanry |
| Private | Howard, Victor Ballard | East YorkshireRegiment- 1st Battalion |
| Private | Hughes, William John | CheshireRegiment- 11th Battalion |
| Private | Hurlow, Albert Arthur | Royal Welsh Fusiliers- 11th Battalion |
| Private | Jackson, William | ConnaughtRangers- 3rd Battalion |
| Private | James, George | Royal Welsh Fusiliers- 16th Battalion |
| Private | Jenkins, David | Welsh Regiment- 24th Battalion |
| CSM | Jenkins, Edwin | Welsh Regiment- 24th Battalion |
| Private | John, Bertie | LancashireFusiliers- 18th Battalion |
| Private | John, David | Welsh Regiment- 24th Battalion |
| Private | John, John Henry | Pembroke Yeomanry |
| Private | John, John James | Welsh Regiment- 24th Battalion |
| Private | John, William | Royal Welsh Fusiliers- 16th Battalion |
| Private | John, William | Welsh Regiment- 24th Battalion |
| Private | Jones, David | Pembroke Yeomanry |
| Private | Jones, David Aaron | Welsh Regiment- 24th Battalion |
| Lance Corporal | Jones, David Robert | Welsh Regiment- 24th Battalion |
| Private | Jones, Evan Lloyd | DurhamLight Infantry- 1/6th Battalion |
| Private | Jones, Evan Richard | Welsh Regiment- 24th Battalion |
| Private | Jones, Frank Egerton | Royal Army Service Corps |
| Private | Jones, Henry | Pembroke Yeomanry-1st Battalion |
| Private | Jones, John | Welsh Regiment- 24th Battalion |
| Private | Jones, Moses | Welsh Regiment- 24th Battalion |
| Private | Jones, Thomas | Welsh Regiment- 24th Battalion |
| Private | Jones, Thomas John | Welsh Regiment- 24th Battalion |
| Private | Jones, W | Pembroke Yeomanry |
| Lieutenant | Karslake, William Reginald | Pembroke Yeomanry |
| Captain | Lambton, Edward (L) | Pembroke Yeomanry |
| Private | Last, E | Pembroke Yeomanry-2/1st Battalion |
| Private | Lewis, Thomas Richard | East YorkshireRegiment- 1st Battalion |
| Private | Little, Walter Charles | Welsh Regiment- 24th Battalion |
| Private | Llewellyn, Wilfred | Pembroke Yeomanry |
| Private | Llewhellin, John Austin | Welsh Regiment- 24th Battalion |
| Private | Lloyd, David | Welsh Regiment- 24th Battalion |
| Private | Marsh, Bertie | DurhamLight Infantry- 1/6th Battalion |
| Private | Morgan, James Clifford | Prince of Wales’LeinsterRegiment- 2nd Battalion |
| Private | Nethercott, Edward Sydney | DurhamLight Infantry- 1/6th Battalion |
| Private | Phelps, Peter Thomas | Pembroke Yeomanry-1/1st Battalion |
| Lance Corporal | Phillips, James Howell | Welsh Regiment- 24th Battalion |
| Private | Phillips, John Evan | Pembroke Yeomanry |
| Private | Postings, Hubert | Welsh Regiment- 24th Battalion |
| Private | Prosser, Charles Baddam | Welsh Regiment- 24th Battalion |
| Boy | Rafferty, Bernard | Pembroke Yeomanry |
| Private | Rees, Albert | Pembroke Yeomanry |
| Private | Rees, David Roderick | Royal Welsh Fusiliers- 11th Battalion |
| Private | Rees, George Ernest | Royal Welsh Fusiliers- 16th Battalion |
| Private | Reid, Charles Richard | Royal Welsh Fusiliers- 1st Battalion |
| Pioneer | Richards, Frederick John | Royal Engineers- Railways |
| Corporal | Richards, Maldwyn | Welsh Regiment- 24th Battalion |
| Private | Richardson, John | RoyalDublinFusiliers- 6th Battalion |
| Private | Roberts, Morley | Pembroke Yeomanry |
| Captain | Roch, George Powell | Pembroke Yeomanry-attd 1st Battalion KSLI |
| Lance Corporal | Saer, David Charles | Welsh Regiment- 24th Battalion |
| Private | Scott, Robert | Pembroke Yeomanry |
| Private | Scourfield, Benjamin David | Welsh Regiment- 24th Battalion |
| Private | Smith, Gilbert James | Welsh Regiment- 24th Battalion |
| Private | Smith, William Arthur | Welsh Regiment- 24th Battalion |
| Private | Southgate,Frederick | Welsh Regiment- 2nd Battalion |
| Private | Speke, Harold | Royal Welsh Fusiliers- 1st Battalion |
| Private | Thomas, David John | Welsh Regiment- 24th Battalion |
| Private | Thomas, David Lewis | Welsh Regiment- 24th Battalion |
| Private | Thomas, David Lewis | LancashireFusiliers- 2/7th Battalion |
| Private | Thomas, David Morgan | Tank Corps |
| Private | Thomas, David Richard | Pembroke Yeomanry |
| Private | Thomas, Evan | Welsh Regiment-13th Battalion |
| Lance Corporal | Thomas, John James | Welsh Regiment- 24th Battalion |
| Private | Thomas, John Samuel | Labour Corps-805th Employment Company |
| Private | Thomas, Thomas James | Welsh Regiment- 24th Battalion |
| Private | Thomas, William | Pembroke Yeomanry-1/1st Battalion |
| Private | Treharne, Thomas Trevor | Welsh Regiment- 9th Battalion |
| Private | Williams, Arthur | Royal Welsh Fusiliers- 16th Battalion |
| Private | Williams, David | Welsh Regiment- 24th Battalion |
| 2nd Lieutenant | Williams, Hugh | Pembroke Yeomanry |
| Private | Williams, James | Pembroke Yeomanry-1/1st Battalion |
| Lieutenant Colonel | Williams, O H S | Pembroke Yeomanry |
| Private | Williams, Sidney James | Royal Welsh Fusiliers- 4th Battalion |
| Private | Williams, William Owen | Pembroke Yeomanry |