1 Harry Day: Biography and Military Career
[1] https://en.wikipedia.org/wiki/Harry_Day — Full biography: birth, family, decorations, POW career, dates
[2] https://www.tracesofwar.com/persons/47285/Day-Harry-Melville-Arbuthnot.htm — DSO citation text, six escape attempts, concentration camps
[3] https://www.rafcommands.com/archive/04559.php — DSO gazette date, escape chronology from official citation
[4] https://victoriacrossonline.co.uk/harry-melville-arbuthnot-wings-day-gc-dso-obe-am-exchanger/ — Albert Medal date, Hendon aerobatics, George Cross exchange
[5] https://www.bigredbook.info/harry_day.html — "King of the Escapers" nickname, only POW to receive DSO
[6] https://britishheritage.com/solders-german-pow-camp-wwii — Day's morale-building speech, early POW leadership

2 HMS Britannia Sinking, November 1918
[7] https://en.wikipedia.org/wiki/HMS_Britannia_(1904) — Torpedo by UB-50 off Cape Trafalgar, 50 dead, 712 crew
[8] https://livesofthefirstworldwar.iwm.org.uk/story/25704 — IWM record: 39 officers and 673 men saved, casualty data
[9] https://blog.adkinshistory.com/hms-britannia/ — Contemporary newspaper accounts of the sinking

3 Albert Medal and George Cross
[10] https://www.thegazette.co.uk/London/issue/31112/page/363 — London Gazette, 7 Jan 1919: Albert Medal citation
[11] https://grokipedia.com/page/Harry_Day — Full Albert Medal citation text, rescue details below decks

4 Day's Capture and Dulag Luft
[12] https://en.wikipedia.org/wiki/Dulag_Luft — Luftwaffe transit/interrogation camp at Oberursel; Day as first SBO
[13] https://www.megamilitary.com/military-history/prisons-prisoners-camps/pow-camps/dulag-luft-durchgangslager-der-luftwaffe-1939-1945 — Dulag Luft operations, interrogation methods, facility details

5 Early Escape Attempts, 1941–1943
[14] https://en.wikipedia.org/wiki/Oflag_XXI-B — Schubin camp history; 35-man tunnel escape, March 1943
[15] https://www.thehistoryreader.com/military-history/prison-break/ — Latrine tunnel at Schubin; Day's role, 33 men out
[16] https://www.spitfirebooks.com/books/wings-day-2-3/ — Chronology of Day's six escapes: Barth, interpreter pass, Schubin

6 Stalag Luft III: Design and Purpose
[17] https://en.wikipedia.org/wiki/Stalag_Luft_III — Camp opened March 1942, anti-tunnel measures, compounds
[18] https://www.history.com/articles/great-escape-wwii-nazi-stalag-luft-iii — Camp built "escape-proof," microphones, yellow sand
[19] https://blogs.icrc.org/cross-files/tales-of-prisoner-of-war-escapes-episode-1/ — ICRC visit reports, security measures, seismic microphones

7 Roger Bushell and the X Organization
[20] https://en.wikipedia.org/wiki/Roger_Bushell — Bushell biography, "Big X," three tunnels, barrister background
[21] https://www.nationalarchives.gov.uk/explore-the-collection/stories/roger-bushell-and-the-great-escape/ — National Archives: camp history document, tunnel details, Bushell's murder
[22] https://www.rafbf.org/great-escape/about-the-great-escape — RAF Benevolent Fund: 600 men, Tom/Dick/Harry, 76 escaped

8 The Great Escape, 24–25 March 1944
[23] https://stalagluft3.com/the-great-escape/ — Night of escape details, moonless night, tunnel fell short
[24] https://www.cwgc.org/liberation/poznan-and-the-great-escape/the-great-escape/ — CWGC: 76 escaped, materials used, memorial at Poznań
[25] https://www.dva.gov.au/recognition-and-commemoration/memorials/memorials-europe/poland-pow-hut-104-stalag-luft-iii — Australian DVA: tunnel 350 ft long, Hut 104, memorial replica

9 Hitler's Order and the Fifty Murders
[26] https://en.wikipedia.org/wiki/Stalag_Luft_III_murders — Hitler's order, Himmler fixed number at 50, cremation of bodies
[27] https://www.ebsco.com/research-starters/military-history-and-science/great-escape-stalag-luft-iii — Hitler ordered execution; Himmler selected 50
[28] https://www.deseret.com/2000/4/20/19502862/great-escape-pows-shot-on-hitler-s-orders/ — Westhoff testimony: Keitel's order, Geneva Convention dismissed

10 Sachsenhausen Concentration Camp
[29] https://encyclopedia.ushmm.org/content/en/article/sachsenhausen — USHMM: camp opened July 1936, 200,000 prisoners, conditions
[30] https://www.sachsenhausen-sbg.de/en/history/1936-1945-sachsenhausen-concentration-camp/ — Official memorial: model camp, SS training center, death toll
[31] https://en.wikipedia.org/wiki/Sachsenhausen_concentration_camp — Sonderlager A and B built 1941, Station Z, crematorium, gas chamber

11 Sonderlager A and Escape from Sachsenhausen
[32] https://en.wikipedia.org/wiki/Johnnie_Dodge — Dodge, Day, James, Dowse sent to Sonderlager A; tunnel escape 23 Sept 1944
[33] https://en.wikipedia.org/wiki/Bertram_James — 110-metre tunnel with cutlery knives; five escapers recaptured
[34] https://edencamp.co.uk/blog/forgottenfriday-jimmy-james/ — Jimmy James account: escape details, solitary confinement, mock executions

12 Flossenbürg and Final Captivity
[35] https://en.wikipedia.org/wiki/Flossenb%C3%BCrg_concentration_camp — Camp history, Bonhoeffer execution, 100,000 prisoners
[36] https://encyclopedia.ushmm.org/content/en/article/flossenbuerg — USHMM: Day's period there; prominent prisoner executions April 1945

13 Liberation at Niederdorf, South Tyrol
[37] https://en.wikipedia.org/wiki/Transport_of_concentration_camp_inmates_to_Tyrol — 139 Prominenten transported; Wehrmacht vs SS standoff; Day crossed Allied lines
[38] https://www.wearethemighty.com/mighty-history/wehrmact-vs-ss-wwii-prisoners/ — Von Alvensleben rescue, SS execution plan thwarted
[39] https://www.tracesofwar.com/articles/4807/VIP-prisoners-of-the-SS.htm — Hotel Pragser Wildsee, 140 prisoners from 17 nations, liberation

14 War Crimes Trials and Aftermath
[40] https://stalagluft3.com/trial-war-crimes/ — Hamburg trial transcript: 18 defendants, 13 hanged February 1948
[41] https://www.legal-tools.org/doc/49610d/pdf/ — Full legal record: Case No. 62, British Military Court proceedings
[42] https://www.iwm.org.uk/collections/item/object/1030012290 — IWM: trial record at Curio Haus, Hamburg, 1 July 1947

15 Day's Decorations and Legacy
[43] https://www.thegazette.co.uk/London/issue/37407/page/1 — London Gazette, 28 Dec 1945: DSO and OBE gazette issue
[44] https://www.thefreelibrary.com/Wings+(Harry)+Day's+A-team.-a030243071 — Day on SS hit list; Niederdorf dinner; post-war legacy