Here is a start.
This is from the Air Force Chronology for 21 February.
1st Bomb Division: A combined force of 336 B-17s from: 91BG; 92BG; 303BG; 305BG; 306BG; 351BG; 379BG; 381BG; 384BG; 401BG; 457BG and 482BG are detached to the primary German airfield targets at Guttersloh; Lippstadt and Werl, Germany but cloud cover obscures these targets and the formations seek out Targets of Opportunity (TOs). 285 aircraft are effective on the following airfields as Targets of Opportunity (TOs): Achmer, Hopstein, Rheine, Diepholz, Quackenbruck and Bramsche. In addition, the railroad marshalling yards at
Coevorden and Lingen, Germany are bombed as Targets of Opportunity (TOs). This is the first combat mission for 457BG. 9 aircraft Failed to Return (FTR) - 24KIA 60POW(1DIC) 5RTD (rescued by ASR). 63 aircraft are damaged. 4 airmen are KIA and another 14WIA in returning aircraft. The bomber gunners of this element claim 12-5-8 of attacking German aircraft. It is not known how many German aircraft were destroyed or damaged on the ground in these strikes, but damage to facilities runways and flak batteries was extensive.
Groups on that mission that lost planes that day were the 91st, 92nd, 351st, 457th, and 482nd, most lost over Germany.
91st BG bombed Achmer:
http://www.91stbombgroup.com/Dailies/322nd1944.html
http://www.91stbombgroup.com/Dailies/323rd1944.html
http://www.91stbombgroup.com/Dailies/324th1944.html as least one plane bombed Loningen.
http://www.91stbombgroup.com/Dailies/401st1944.html
For the 92bd BG: primary was Lippstadt, they bombed Hopstein, Germany
http://92ndma.org/missions.html
Here is the mission report for the 303rd:
http://www.303rdbg.com/missionreports/110.pdf
The 303rd BG sent two groups, A and B. Group A bombed an alternate target (Diepholz, Germany) but Group B brought their bombs back.
The leader of that group was threatened with court-martial for not bombing something in Germany.
The 306th BG bombed Rheine-Hopstein.
The 351st BG bombed Achmer:
http://www.351st.org/351stMissions/M...Mission82.html
The 379th BG bombed Quakenbruck / Bramsche :
http://www.379thbga.org/pdfs/missionreports.pdf
The 381st BG bombed Achmer:
http://www.381stbg.org/missions.php
The 384th BG bombed Lingen. Sortie reports:
http://www.384thbombgroup.com/_conte...?MissionKey=65
The 401st BG was assigned Lippstadt:
http://401bg.org/Main/People/Maslen/401stBG(H).pdf
but they bombed an alternate target
they identified as "Emlichein" (Emlichheim):
http://401bg.org/Main/People/Maslen/613th.pdf
Now Emlichheim is right next to Coevorden. They share a border. It is interesting to note that the Air Force Chronology given above does not list Emlichein/Emlichheim as a target of opportunity, even though the 401st claimed they bombed it. So it is
"possible" they attacked Coevorden in error. The Air Force Chronology may have
"correctly" given the actual target bombed by the 401st.
Here are a couple of another 401st squadron reports:
http://401bg.org/Main/People/Maslen/614th.pdf Note the "odd" wording: "A target of opportunity was quickly selected and bombed and
was later identified as Emlichein, Germany."
http://401bg.org/Main/People/Maslen/615th.pdf Again a slightly odd wording. "The target of the lead Group on this raid
was identified
as Emlichheim, near the Netherlands border."
The 457th flew two groups A & B. The A group bombed an airfield near Hamm and the B group did not bomb.
http://www.457thbombgroup.org/Narratives/MA1.html
The 482nd was a pathfinder group, with planes typically leading other groups.
Here is a Dutch website about the attack.
http://www.drentheindeoorlog.nl/?aid=361
Here is a Google translation of the site:
https://translate.google.com/transla...61&prev=search
The first photo on the website appears to be a strike attack vertical photo. The bombs are falling at about this location. 52.654423, 6.733882 The strike photo has North to the lower right corner. If the website has the original entire strike photo, there should be notations on the edges which would indicated which BG and plane that took the photo.
https://www.google.com/maps/place/52...423!4d6.733882
Update on the photo.
The photo is an RAF photo, taken during an Operation Clarion attack by RAF B-25s of the No. 139 Wing, No. 2 Group, on the rail-canal crossing at Coevorden on the Dutch-German border:
https://www.iwm.org.uk/collections/i...ject/205023578
It also appears there are some old bomb craters in the photo from a previous attack. Note that Operation Clarion occurred on Feb 22 -23, so this photo is after the US operations of February 21.