Bombs from second box undershot, the stick ending just APPENDIX I
111
C O N F I D E N T I A L .
FROM :- S.I.O. NO 21 SQUADRON S.A.A.F.
TO :- H.Q. M.A.A.F. ( ATTENTION OPERATIONS RECORDS.)
H.Q. M.A.T.A.F.( S.C.O.R.U.)
S.A.O.A. ADV. S.A.A.F. H.Q. C.M.F.
S.I.O. 3 S.A. WING S.A.A.F.
REF :- 21S/960.
DATE :- 12th MARCH 1945.
OPREP NO 960 FOR THE PERIOD ENDING 2100 HOURS ON THE 11TH MARCH '45.
RAID ON CASARSA M/Y pp C 103877 REF. MAP ITALY 1,100,000 SHEET NO 39
OPERATION NUMBER 165/21S/M.
A : 10 Marauders airborne JESI L/G between 1330 and 1610 hours
to bomb CASARSA M/Y. After R/V with 8 Thunderbolts at FANO
at 1405 hours formation set course for target and bombed
from 11 - 12000' at 1505 hours. First box had left lateral
error of about 100 yards no bombs falling on the target.
Bombs from second box undershot, the stick ending just
short of the target. Stick from the third box started
short and finished in the yards. Two A/C had hang-ups
of 1x250 lb which were jettisoned at sea. Flak :- There
were four to six bursts of inaccurate H/A/A observed over
the target. Weather was fair over target with no cloud
below, and visibility was fair to poor in haze.
B : (1) 10 MARAUDERS (ii) Nil.
C : (i) Nil. (ii) Nil.
D : (1) 25.50 Hours. (ii) Nil.
E : (1) 34,000 x .5 (ii) Nil. (iii) Nil.
F : (1) 60 x 500 lb G.P. (ii) 60 x 500 (iii) 2 x 250
40 x 250 lb 38 x 250 (iv) Nil.
324 lb's Window.
13 Pkts. Pamphlets.
Fused Tail Only 30 - 51.
V : NIL.
Z : NIL.
[Signed] S.F. Wiggill
------------------- LT. Capt.
S.I.O. 21 SQUADRON S.A.A.F.
Handwritten Marginalia / Stamps:
* Folio Number: 111 (Handwritten, Top Right).
* Reference Stamp:
The National Archives' reference AIR 27/271/3
APPENDIX I
111
C O N F I D E N T I A L .
FROM :- S.I.O. NO 21 SQUADRON S.A.A.F.
TO :- H.Q. M.A.A.F. ( ATTENTION OPERATIONS RECORDS.)
H.Q. M.A.T.A.F.( S.C.O.R.U.)
S.A.O.A. ADV. S.A.A.F. H.Q. C.M.F.
S.I.O. 3 S.A. WING S.A.A.F.
REF :- 21S/960.
DATE :- 12th MARCH 1945.
OPREP NO 960 FOR THE PERIOD ENDING 2100 HOURS ON THE 11TH MARCH '45.
RAID ON CASARSA M/Y pp C 103877 REF. MAP ITALY 1,100,0…
__o_O_o__
Form 541 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); series 271 specifically catalogs the historical files for 21 Squadron SAAF.
* 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 report cites "Marauders" (Martin B-26), this reflects the squadron's integration into 3 Wing SAAF administrative reporting during the final phase of operations.
* C.M.F.: Central Mediterranean Force.
* G.P. (General Purpose): Standard high-explosive ordnance (500 lb and 250 lb variants) fused for the destruction of physical structures like rail tracks and rolling stock.
* H/A/A (Heavy Anti-Aircraft): Large-caliber German anti-aircraft artillery (typically 8.8 cm) capable of engaging medium bombers at the 12,000' altitude mentioned in the report.
* Hang-ups: Mechanical failures where ordnance fails to release from the aircraft's bomb shackles during the bomb run.
* JESI L/G: Jesi Landing Ground, Italy; the operational base for 21 Squadron in March 1945.
* M/Y (Marshalling Yards): Extensive railway yards used for sorting rolling stock; the Casarsa yards were a critical node in the Venetian sector.
* MC/GP: Medium Capacity / General Purpose; standard Allied aerial ordnance classifications.
* MET (Meteorological Report): Weather intelligence; the report notes fair conditions with haze reducing visibility.
* R/V: Rendezvous; the tactical coordination point at Fano for formation assembly with the 8 Thunderbolt escorts.
* S.C.O.R.U.: Section for Operational Research and Underlining (or Unit), responsible for analyzing strike accuracy.
* S.I.O.: Squadron Intelligence Officer. Lieutenant Captain S.F. Wiggill was tasked with mission debriefing and OPREP compilation.
* Thunderbolts: Republic P-47 Thunderbolt fighter-bombers provided for top-cover and escort.
* Window: Chaff; strips of aluminum foil (324 lbs dispensed) used to saturate German radar-directed defenses.
Operational Context
Target File 271-3_20 chronicles Operation Number 165/21S/M, a 10-aircraft strike launched on March 11, 1945, against the Casarsa Marshalling Yards. By March 1945, the Mediterranean Allied Air Forces (MAAF) were executing Operation Bingo, a comprehensive interdiction campaign intended to isolate German Heeresgruppe C by systematically severing the logistical network in Northern Italy. The Casarsa yard was a vital rail junction on the route to the Austrian border, serving as a critical artery for Axis materiel.
This methodology represents the strategic maturation of principles established during the 1943 battles for the Bernhardt and Gustav Lines. In November 1943, 21 Squadron SAAF executed high-intensity strikes on localized bottlenecks, such as location H055630, to paralyze German reserves attempting to reach the front. By March 1945, the emphasis had shifted to theater-wide strategic isolation. The report highlights the tactical difficulties encountered over Casarsa: while the third box successfully hit the yards, the first and second boxes suffered from lateral and range errors, illustrating the challenges of precision visual bombing in hazy conditions. Despite inaccurate heavy flak, the formation successfully integrated kinetic destruction with the non-kinetic distribution of 13 packets of propaganda pamphlets and significant Window deployment to maintain pressure on the crumbling Axis logistical depth.
21
Phase 1: Verification & Extraction
Identity Check: 11 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.
* BKR: Operational identifier for the aircraft or box leader (Aircraft 'K' of Box 'R') 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. Although the squadron was part of a wing increasingly utilizing Marauders, archival context within AIR 27/271 confirms the Baltimore's continued role in tactical interdiction and strike photography during this period.
* F14||: Technical camera data indicating a focal length of 14 inches, utilized for high-altitude vertical strike photography.
* C1007: Specific map grid coordinates for the Casarsa target area.
* 11500: 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 infrastructure and rolling stock.
* MET (Meteorological Report): Atmospheric intelligence used to coordinate sorties; the clarity of the vertical photograph indicates "fair" visual bombing conditions at 1507 hours on March 11, 1945, despite reports of haze.
* SA21/47: The specific mission and unit identifier for this operation (21 Squadron SAAF).
Operational Context
Target File 271-3_21 is a vertical strike photograph documenting an attack on the Casarsa Marshalling Yards on March 11, 1945. Located in the Venetian sector of Northern Italy, Casarsa was a vital rail junction supporting the movement of German materiel toward the Austrian border. 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 German Heeresgruppe C by systematically severing all supply and escape routes through the Po Valley and Alpine passes.
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 the 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 bomb bursts concentrated across the rail lines, corroborating OPREP 960's report that the third box successfully hit the yards to render the Axis rail network unusable during the final Allied spring offensive.
22
Phase 1: Verification & Extraction
Identity Check: 13th MARCH 1945.