The artwork is based on an event during WW2. A bomber group of B-24's have completed their "trolley run" mission over a large marshaling yard at Altstadt. Many of the missions were led by British PFF (Pathfinders Fighter Forces) equipped with the latest British design radar, H2X which was never detected by the Germans during WW2.
Below is an actual day mission of the Mighty 8th Air Force during the latter part of the War. Over powering when you see the numbers of aircraft involved. The Germans had no air defense and only a few flak trains to defend their rail yards during this time. Bombing rail and marshaling yards were called "trolley runs" similar to a "milk run".
"WEDNESDAY, 3 JANUARY 1945
STRATEGIC OPERATIONS (Eighth Air Force): Mission 778: 1,168 bombers and 589 fighters are dispatched to attack rail and communications targets in W Germany; all are PFF attacks using H2X, Gee-H and Micro H; they claim 4-0-0 Luftwaffe aircraft; 4 fighters are lost:1. 417 B-17s are sent to hit marshalling yards at Fulda (141) and Aschaffenburg (124) and communications centers at Gemund (38) and Schleiden (36); the Mosel marshalling yard at Koblenz, a secondary target, is hit by 36 bombers; targets of opportunity are the Pforzheim marshalling yard (25) and other (3); 1 B-17 is damaged; 2 airmen are WIA. Escort is provided by 219 of 227 P-51s; they claim 4-0-0 aircraft; 1 P-51 is lost (pilot MIA) and 4 damaged beyond repair.
2. 325 B-24s are dispatched to hit marshalling yards at Altstadt (31), Homburg (41), Zweibrucken (55), Neunkirchen (84), Landau (59) and the Pirmasens railhead (41); 2 B-24s are damaged beyond repair and 1 damaged. Escorting are 143 of 148 P-51s.
3. 421 B-17s are sent to hit the Hermulheim W (72) and E (36) marshalling yards, a communications center at St Vith, Belgium (98), and rail junctions at Mondrath (36) and Horrem (1); 100 B-24s hit the secondary target, Cologne; targets of opportunity are Rheydt (10) and other (3); 11 B-17s are damaged. The escort is 145 of 150 P-51s; 3 P-51s are lost (pilots MIA).
4. 32 of 32 P-51s fly a scouting mission."