The Squadron’s Operations Record Book shows that JH Marks was the Captain of a 35 Squadron aircraft on the following sorties:
- 07/08/1941 Essen
- 12/08/1941 Berlin
- 30/03/1942 Battleship
- 12/04/1942 Essen
- 27/04/1942 Battleship
- 19/05/1942 Mannheim
- 30/05/1942 Cologne
- 01/06/1942 Essen
- 25/06/1942 Bremen
- 13/07/1942 Duisburg
- 26/07/1942 Hamburg
- 29/07/1942 Saarbrucken
- 31/07/1942 Dusseldorf
- 18/08/1942 Flensburg
- 19/09/1942 Saarbrucken (Failed to Return)
The following shows the composition of his crew on these sorties, along with the number of sorties undertaken by each airman as part of his crew (as recorded in the squadron’s Operations Record Book). Details of all flights (including training flights) will be recorded in their Flying Log Books:
| (Pilot) | James Hardy Marks | 15 |
| (2nd Pilot) | Angus Carr MacKenzie | 1 |
| Major King | 1 | |
| Michael Gerard Garner | 1 | |
| Wesley Leonard Belous | 1 | |
| [-] Hrehorak | 1 | |
| [-] Whiteley | 1 | |
| (Navigator) | Raymond William Bullen | 1 |
| William Robert Francis Grierson-Jackson | 1 | |
| Alan James Child | 5 | |
| Alfred Abels | 6 | |
| John Peter Boston Cushion | 1 | |
| Kenneth Randolph Sewell | 1 | |
| (Air Bomber) | A Sanderson-Millar | 2 |
| Charles Vincent Harvey | 1 | |
| (WOP / AG) | Harry James Leonard Peto | 3 |
| Reginald John Lambert Sawyers | 10 | |
| Denis Slater | 1 | |
| Francis Edwin Flint | 1 | |
| George Arthur Brassey | 1 | |
| Gordon Ernest Cranstone | 1 | |
| James Patrick Henderson | 1 | |
| JI Robinson | 1 | |
| John Peter Burton Buckley | 1 | |
| Stanley Frank Hazleton | 1 | |
| (Possibly) John Andrew Catley | 1 | |
| (Air Gunner) | Edward Lawrence Whillock | 1 |
| Edward Wilkinson | 1 | |
| George Pomroy | 1 | |
| John Meredith Fryer | 1 | |
| LH Clark | 1 | |
| Mark Anthony Sachs | 1 | |
| Norman Harry Wright | 5 | |
| Richard Langton Leith-Hay-Clark | 7 | |
| Richard Lionel Prosser | 1 | |
| Royston Denis William Carrington | 1 | |
| Wallace Llewellyn Berry | 1 | |
| [-] Hill | 1 | |
| [-] Russell | 1 | |
| (Flight Engineer) | Edward James Morris | 1 |
| Frederick James Rogers | 1 | |
| George Percy Price | 1 | |
| Howard Torrens McQuigg | 1 | |
| James Cunningham McKnight | 1 | |
| Norman Willingham | 1 | |
| Robert George Gumbley | 1 | |
| William G Higgs | 4 | |
| [-] Burtonshaw | 4 |
Photo Gallery (Main Crew Members)
JH Marks
Posting Dates
| Marks | James Hardy | In From: | 58 Squadron | 25/07/1941 |
| Out to: | 10 O.T.U. | 12/03/1942 | ||
| In From: | ||||
| Out to: | War Casualty | 19/09/1942 |
