
June 15, 2025. On April 26, 2025 we travelled to Schoonebeek in the province of Drenthe, The Netherlands, to meet Yannic Wethly, one of the volunteers at the Air Research Drenthe Foundation (Stichting Luchtoorlog Onderzoek Drenthe). This non-profit organization researches WWII air crashes in the province and places information panels near the crash sites.
We’d been involved with a similar organization in the province of Friesland, Missing Airmen Memorial Foundation, to honour the crew of the last flight of Halifax L9561 in which the pilot, Elmer Bagnall MUTTART of Cape Traverse, Prince Edward Island, lost his life. This led to a memorial panel being placed outside the village of Wons on October 12, 2019. (See https://onthewarmemorialtrail.com/2019/11/18/on-the-war-memorial-trail-the-memorial-panel-in-wons-is-unveiled/)
Yannic had gotten in contact about the last flight of Halifax DT630, in which the pilot, Jack Douglas MACKENZIE of Winnipeg, Manitoba, and three other crew members, lost their lives. We’ve stayed in touch, and were happy to meet Yannic in person at an excellent exhibition that the organization held in Schoonebeek, entitled ‘The Last Flight – The airwar around Schoonebeek’.

Pieter and Daria with Yannic Wethly of the Air Research Drenthe Foundation. (Photo courtesy of Valkenburg Family)
After touring the exhibit, we were joined by Yannic’s father, and in the end we were in Schoonebeek for 2 hours!
….Our first flags were placed at 4 graves in Sleen General Cemetery…

The village of Sleen was not far away from Schoonebeek. (Photo credit: Daria Valkenburg)
From Schoonebeek we went to Sleen General Cemetery to honour the 4 airmen who lost their lives on February 3, 1943 during the last flight of Halifax DT630 (call sign VR-T), one of 8 heavy Halifax bombers sent on a night raid to Hamburg, Germany.
The cemetery was outside the village of Sleen, and off of a narrow lane, with a farmer’s field on the other side of the cemetery.

Sign directing us to Sleen General Cemetery. (Photo credit: Daria Valkenburg)
We didn’t know what to expect once we turned into the tree-lined entrance to the cemetery. It was much larger than we thought, and very well-maintained.

The tree-lined entrance from the road into Sleen General Cemetery provided an aura of serenity. (Photo credit: Daria Valkenburg)
Out of a crew of 7, four men, all with the Royal Canadian Air Force (RCAF), died and are buried in Sleen:
- Pilot P/O Jack Douglas MACKENZIE of Winnipeg, Manitoba
- Flight Engineer Sgt. William Peter DUTHIE of Winnipeg, Manitoba
- Air Gunner W/O II Raymond Hepton HILL of Montreal, Quebec
- Air Gunner W/O II Lennox Alwin GONNETT of Westmount, Quebec
You can read Jack Douglas MacKenzie’s story at https://onthewarmemorialtrail.com/2023/02/19/on-the-war-memorial-trail-the-wwii-pilot-killed-at-the-controls-of-his-halifax-bomber/

After placing Canadian and provincial flags, Pieter paid his respects by the graves of the 4 airmen. (Photo credit: Daria Valkenburg)
Canadian flags were placed at all four graves. Manitoba flags were placed at the graves of Jack Douglas MacKenzie and William Peter Duthie. Quebec flags were placed at the graves of Raymond Hepton Hill and Lennox Alwin Gonnett.

Pieter by Jack MacKenzie’s grave in Sleen General Cemetery. (Photo credit: Daria Valkenburg)
The three surviving crew members – 2 from the RCAF and 1 from the Royal Air Force (RAF) – spent the remainder of the war years in prisoner of war camps:
- Navigator Sgt. William Nelson GARNETT, RCAF
- Bomb Aimer Sgt. Eric Raymond MARQUAND, RCAF
- Rear Air Gunner F/Sgt. Alexander Henry MILTON, RAF
Sleen General Cemetery was the first of 14 cemeteries that we visited during our trip, and the first 4 graves, out of a total of 383 graves, at which Pieter placed flags. All of the flags placed on our war memorial tour had been donated, as mentioned in an earlier posting. (See https://onthewarmemorialtrail.com/2025/06/04/on-the-war-memorial-trail-flags-and-pins-received-for-our-2025-european-war-memorial-tour/)
Thank you to the following for the donation of flags placed at the graves in Sleen General Cemetery:
- Mario Henry and his brother Etienne Henry, who donated the Quebec flags
- Wayne Ewasko, MLA for Lac Du Bonnet, Manitoba, Interim Leader of the Official Opposition, Province of Manitoba, who donated the Manitoba flags
- Alan Waddell, Constituent Assistant, on behalf of Heath MacDonald, MP (Member of Parliament) for Malpeque, PEI, who donated the Canadian flags
Over the next several postings, we’ll continue to share the highlights of our adventures on the 2025 European War Memorial Tour. Next up on our journey of remembrance is the Canadian War Cemetery in Groesbeek, where Pieter placed flags at 120 graves.
Now that we’re back home, the research work continues for Pieter. If you have photos or information to share about soldiers buried in The Netherlands or Belgium, please email him at memorialtrail@gmail.com, or comment on the blog.
© Daria Valkenburg
….Want to follow our research?…
If you are reading this posting, but aren’t following our research, you are welcome to do so. Our blog address: https://onthewarmemorialtrail.com/
4 countries, 6 weeks, 7,000 km – an unforgettable war memorial journey in Europe…. Daria’s book ‘No Soldier Buried Overseas Should Ever Be Forgotten‘ is available in print and e-book formats. Net proceeds of book sales help support research costs and the cost of maintaining this blog. For more information see https://nosoldierforgotten.com/
Subscribe to our YouTube Channel: On The War Memorial Trail With Pieter Valkenburg: https://www.youtube.com/channel/UCJ591TyjSheOR-Cb_Gs_5Kw.
Never miss a posting! Subscribe below to have each new story from the war memorial trail delivered to your inbox.





















