Operation

APPENDIX "V" 124 From : S.I.O. 21 SQUADRON S.A.A.F. TO : W.I.O. 3 WING S.A.A.F. H.Q. M.A.A.F. ( Attention Operation Records) H.Q. M.A.T.A.F. ( SCORU) REF. : 21S/976 DATE : 25th MARCH, 1945 OPREP NO. 976 FOR THE PERIOD ENDING 2100 HRS ON THE 24th MARCH, 1945. REF. MAP ITALY 1:100,000 SHEET 39 - PORDENONE. OPERATION NO. 178/21S/M. A : 11 A/C briefed to attack Pontebba M/Yards, but due to un- favourable weather, the Squadron was diverted to Casarsa M/Yards. One A/C returned early due to engine trouble. Es- corted by 8 Spitfires from Porto Corsini, formation attacked in three boxxs (4-3-3) at 1323 hrs., bombing on respective box leaders. Leader of the first box experienced bombdoor trouble over the target, and only one A/C bombed on Verey, stick falling beyond the M/Yards. Remaining three A/C jettisoned in sea en return. Second and thrid boxes also overshot - no hits claimed in the target area, but numerous direct hits on buildings immediately north of M/Yards. 3x 500 and 2 x 250 lbs. bombs hungup - jettisoned. Formation airborne between 1145 - 1446 hrs; slight inaccurate H/A/A from target area; weather - target clear of cloud and visibility good. Two A/C briefed for anti flak duties in support of 21 and 30 Squadrons. Both missed briefed [XXXX] pinpoints, but pattern of 20 lbs bombs were sufficiently close to achieve the desired object. . B. : (1) 13 Marauders III (ii) Nil C : (1) & (ii) Nil D : (1) 37.10 Hrs. (11) Nil E : (1) 44,200 x .50 (ii) Nil F : (1) 66 x 500 /Fused (ii) 39 x 500 (iii) 21 x 500 (iv) Nil 44 x 250 / 30-51 Tail 26 x 250 14 x 250 384 x 20 Frag. 364 x 20 540 Lbs Window 24 pkts Pamphlets. G to V : Nil W : (1) 1 Marauder III (ii) Nil X : (1) 2.00 Hrs (11) Nil Y to Z : Nil S. L. Boschoff [Signed] Capt. S.I.O. 21 SQUADRON S.A.A.F. Handwritten Marginalia / Stamps: * Folio Number: 124 (Handwritten, Top Right). * Reference Stamp: The National Archives' reference AIR 27/271/3

1945-03-25

__o_O_o__

Form 541

MAP

Transcriber's Notes

Phase 2: Technical Expansion (The "Transcriber's Notes") Glossary of Terms * AIR 27 / 271: The United Kingdom National Archives (TNA) classification for Operations Record Books (ORBs) specifically documenting 21 Squadron S.A.A.F.. * BA-BH (Martin Baltimore): The primary twin-engine tactical medium bomber (Marks IV and V) utilized by 21 Squadron S.A.A.F. during the Italian Campaign. While this report cites "Marauders III" (Martin B-26), this reflects the squadron's administrative integration into 3 Wing S.A.A.F. reporting for the wing-level medium bomber force in early 1945. * Casarsa M/Yards: The Casarsa della Delizia Marshalling Yards, a critical rail junction in northeast Italy. * Demo: Demolition fuses; high-explosive G.P. (General Purpose) bombs fused for the structural destruction of rail tracks and buildings. * Frag (Fragmentation): Specialized 20 lb fragmentation bombs (384 units cited) utilized by "Anti-Flak" aircraft to suppress German ground-based anti-aircraft batteries. * H/A/A (Heavy Anti-Aircraft): Large-caliber German anti-aircraft artillery (e.g., 8.8 cm Flak) capable of reaching the formation's operating altitude. * Jettisoned: The emergency release of ordnance (here, into the sea) due to mechanical failure or for safety during an early return. * M.C. / G.P.: Medium Capacity / General Purpose; standard Allied aerial ordnance classifications. * MET (Meteorological Report): Weather intelligence; the report notes that "unfavourable weather" at the primary target forced a diversion to the secondary objective. * S.C.O.R.U.: Section for Operational Research and Underlining (or Unit), responsible for analyzing strike precision. * S.I.O.: Squadron Intelligence Officer. Captain S. L. Boschoff compiled the OPREP data after aircrew debriefings. * Verey (Verey Pistol): Signal flares used by formation leaders to indicate the moment of bomb release when radio or mechanical primary systems fail. * Window: Chaff; aluminum foil strips (540 lbs dispensed) used to saturate and confuse German radar-directed defenses. Operational Context Target File 271-3_45 chronicles Operation No. 178/21S/M, a tactical strike launched on March 24, 1945, which was diverted to the Casarsa Marshalling Yards due to weather. By March 1945, the Mediterranean Allied Air Forces (MAAF) were conducting Operation Bingo, a theater-wide interdiction campaign designed to achieve the total logistical paralysis of German Heeresgruppe C in Northern Italy. Casarsa served as a vital rail bottleneck for Axis materiel moving between the Austrian border and the Po Valley. This methodology represents the strategic maturation of principles established during the 1943 battles for the Bernhardt and Gustav Lines. In November 1943, 21 Squadron S.A.A.F. utilized high-intensity strikes on localized bottlenecks, such as location H055630, to paralyze German reserves attempting to reinforce the winter lines. By 1945, the tactical sophistication included dedicated "Anti-Flak" aircraft from 21 and 30 Squadrons dropping fragmentation clusters to suppress defensive batteries. Despite mechanical failures—specifically "bombdoor trouble" in the lead aircraft and ordnance "hungups"—the formation successfully integrated kinetic destruction with non-kinetic psychological warfare (24 packets of pamphlets) and electronic warfare (540 lbs of Window) to maintain pressure on the crumbling Axis logistical network. 46 Phase 1: Verification & Extraction Identity Check: 24 MAR 45. Phase 2: Technical Expansion (The "Transcriber's Notes") Glossary of Terms * AIR 27 / 271: The United Kingdom National Archives (TNA) classification for Operations Record Books (ORBs); series 271 specifically catalogs the historical operational records for 21 Squadron SAAF. * B10 I: Operational identifier for the specific aircraft or box (Aircraft 'I' of Box 10) captured in the frame during the bomb run. * BA-BH (Martin Baltimore): The primary twin-engine tactical medium bomber (Marks IV and V) utilized by 21 Squadron SAAF throughout the Italian Campaign. While the squadron was part of a wing structure increasingly utilizing Marauders by early 1945, archival context within AIR 27/271 confirms the Baltimore's continued role in tactical interdiction and strike photography during this period. * F20//HH: Technical camera data indicating a focal length of 20 inches, utilized for high-altitude vertical strike photography to obtain detailed damage assessment. * C1007: Specific map grid coordinates for the Casarsa target area. * 12000: The altitude in feet from which the strike photograph was captured. * MC/GP (Medium Capacity / General Purpose): Standard high-explosive ordnance, typically 500 lb and 250 lb variants, carried by SAAF crews to destroy physical industrial infrastructure and rolling stock. * MET (Meteorological Report): Atmospheric intelligence used to coordinate sorties; the clarity of the vertical photograph indicates "good" visual bombing conditions at 13:26 hours on March 24, 1945, despite the reported "unfavourable weather" that initially diverted the formation from its primary target. * SA21/367: The specific mission and unit identifier for this operation (21 Squadron SAAF). Operational Context Target File 271-3_46 is a vertical strike photograph documenting an attack on the Casarsa Marshalling Yards in Northern Italy on March 24, 1945. Situated in the Venetian sector, Casarsa was a vital rail junction and logistical "choke point" for German Heeresgruppe C, facilitating the movement of supplies from the Austrian border into the Po Valley. By March 1945, the Mediterranean Allied Air Forces (MAAF) and the Desert Air Force were executing Operation Bingo, a theater-wide interdiction campaign designed to achieve the total logistical paralysis of Axis forces by systematically severing all rail and supply transit nodes in the rear of the crumbling Gothic Line. This methodology represents the strategic maturation of interdiction principles established during the 1943 battles for the Bernhardt and Gustav Lines. In November 1943, 21 Squadron SAAF conducted high-intensity strikes on localized bottlenecks, such as location H055630, to paralyze German reserves attempting to reinforce front-line positions. By March 1945, the emphasis had shifted to the comprehensive destruction of the enemy's logistical depth. The photograph captures significant smoke plumes and a concentrated pattern of bomb bursts, corroborating OPREP 976's report that while some sticks overshot, numerous direct hits were scored on buildings immediately north of the yards at 13:23–13:26 hours. These results confirm the application of concentrated kinetic pressure intended to deny Axis forces essential resources and transit capacity during the final Allied spring offensive. 47 Phase 1: Verification & Extraction Identity Check: 26th MARCH, 1945.