The 4th Cadre Rifle Brigade (future 1st Polish Independent Parachute Brigade) training at Elie in Fife in September 1941, which was witnessed by General Władysław Sikorski, the C-in-C of the Polish Armed Forces. 📸 Walter Thomas Lockeyear / IWM (H 14159)

U-class destroyer HMS URCHIN (R99) photographed off Greenock on 26 September 1943, just after its commissioning. 📸 Lt S J Beadell / IWM (A 19464)

Soldiers of the 45th Battalion, Australian 4th Division, wearing Small Box Respirators (SBR) in an advanced trench at Garter Point, during the Third Battle of Ypres (Passchendaele) on 27 September 1917. 📸 IWM (E(AUS) 825)

The 4th Cadre Rifle Brigade (future 1st Polish Independent Parachute Brigade) training at Elie in Fife in September 1941, which was witnessed by General Władysław Sikorski, the C-in-C of the Polish Armed Forces. 📸 Walter Thomas Lockeyear / IWM (H 14159)

26 September 1854: The Allied army crossed the Tractir Bridge over the Chernaya River to the east of Sevastopol. British forces moved to occupy the small port of Balaklava as their supply base, while the French secured the more spacious port of Kamiesch as their base.

U-class destroyer HMS URCHIN (R99) photographed off Greenock on 26 September 1943, just after its commissioning. 📸 Lt S J Beadell / IWM (A 19464)

25 September 1854: The Allied army came within sight of Sevastopol. Ruling out a direct assault on Sevastopol from the north, the Allied commanders began a flank march around it to lay siege from the south and moved to secure the ports of Balaklava and Kamiesch.

Major-General Robert E Urquhart, commanding 1st British Airborne Division, with the Pegasus airborne pennant in the grounds outside his headquarters at the Hartenstein Hotel in Oosterbeek during Operation MARKET GARDEN on 22 September 1944. 📸 Sgt S M Smith / IWM (BU 1136)

A British captain points his Enfield No. 2 revolver from 1st Airborne Division's headquarters in the Hartenstein hotel at Oosterbeek on 23 September 1944, during Operation MARKET GARDEN 📸 IWM (BU 1116).

23 September 1854: The Allies moved out from their camps at the Alma and continued on towards Sevastopol, halting at the Katcha River. On the same day, the Russians continued to scuttle ships of their Black Sea Fleet to block the entrance to Sevastopol harbour.

A British captain points his Enfield No. 2 revolver from 1st Airborne Division's headquarters in the Hartenstein hotel at Oosterbeek on 23 September 1944, during Operation MARKET GARDEN 📸 IWM (BU 1116).

Major-General Robert E Urquhart, commanding 1st British Airborne Division, with the Pegasus airborne pennant in the grounds outside his headquarters at the Hartenstein Hotel in Oosterbeek during Operation MARKET GARDEN on 22 September 1944. 📸 Sgt S M Smith / IWM (BU 1136)

Soldiers of the 13th Battalion, Durham Light Infantry, in trenches just prior to their attack towards Veldhoek on 20 September 1917 at the start of the Battle of the Menin Road Ridge during the Third Battle of Ypres. 📸 Lt John Warwick Brooke / IWM (Q 5966)

Winston Churchill, his wife Clementine and their daughter Mary bid goodbye to the crew of the battlecruiser HMS RENOWN, which brought them back to Greenock on 20 September 1943 following Churchill's attendance at the First Quebec Conference. 📸 IWM (A 19209)

An officer of the 1st Battalion, Cameronians (Scottish Rifles) with a horse of the 9th (2nd Pomeranian) Uhlans, which had been captured in the cavalry action at Nery on 1st September 1914. 📸 Robert Cotton Money / IWM (Q 51483)

Soldiers of the 13th Battalion, Durham Light Infantry, in trenches just prior to their attack towards Veldhoek on 20 September 1917 at the start of the Battle of the Menin Road Ridge during the Third Battle of Ypres. 📸 Lt John Warwick Brooke / IWM (Q 5966)

20 September 1854: The Allied army attacked Prince Alexander Menshikov's Russian army occupying the heights overlooking the River Alma in the Crimea. In less than three hours, the Russians were dislodged at the bayonet point, the Highlanders firing their rifles "within a yard of the Russians".

Winston Churchill, his wife Clementine and their daughter Mary bid goodbye to the crew of the battlecruiser HMS RENOWN, which brought them back to Greenock on 20 September 1943 following Churchill's attendance at the First Quebec Conference. 📸 IWM (A 19209)

Naval mines loaded on a light railway on their way to the quay at Inverness on 18 September 1918. The mines would be used in the North Sea Mine Barrage, a major US and British anti-submarine effort to block German naval ships and submarines in the North Sea. 📸 IWM (Q 20251)

19 September 1854: As the Allied army set off towards Sevastopol, the British advance guard encountered Russian cavalry at the Bulganak River which were engaged by Lord Cardigan's Light Cavalry Brigade supported by 'C' Troop Royal Horse Artillery, with Riflemen riding on the guns into action.

Naval mines loaded on a light railway on their way to the quay at Inverness on 18 September 1918. The mines would be used in the North Sea Mine Barrage, a major US and British anti-submarine effort to block German naval ships and submarines in the North Sea. 📸 IWM (Q 20251)

Soldiers of 50th (Northumbrian) Division moving up past a knocked-out German 88mm gun near 'Joe's Bridge' over the Meuse-Escaut Canal in Belgium on 16 September 1944

The US 82nd Airborne Division dropping near Grave, Netherlands, on 17 September 1944, at the beginning of Operation MARKET GARDEN. Livestock are grazing near gliders that landed earlier.

HMS ARK ROYAL and other ships of the Home Fleet, including BULWARK and EAGLE and the cruiser SHEFFIELD, anchored in the Clyde shortly before the beginning of the NATO exercise STRIKEBACK in September 1957. 📸 © Crown copyright IWM (A 33882)

Troops of 'B' Battery, 9th Field Brigade, Royal Artillery, marching from the quayside having disembarked from the troopship 'Worthing' at Cherbourg in France on 16 September 1939. 📸 IWM (O 11)

The US 82nd Airborne Division dropping near Grave, Netherlands, on 17 September 1944, at the beginning of Operation MARKET GARDEN. Livestock are grazing near gliders that landed earlier.

Soldiers of 50th (Northumbrian) Division moving up past a knocked-out German 88mm gun near 'Joe's Bridge' over the Meuse-Escaut Canal in Belgium on 16 September 1944

Troops of 'B' Battery, 9th Field Brigade, Royal Artillery, marching from the quayside having disembarked from the troopship 'Worthing' at Cherbourg in France on 16 September 1939. 📸 IWM (O 11)

HMS ARK ROYAL and other ships of the Home Fleet, including BULWARK and EAGLE and the cruiser SHEFFIELD, anchored in the Clyde shortly before the beginning of the NATO exercise STRIKEBACK in September 1957. 📸 © Crown copyright IWM (A 33882)

British Mark I tanks fuelling up prior to the battle of Flers–Courcelette on 15 September 1916 during the battle of the Somme. This would be the first time tanks would go into combat. They were operated by the Heavy Branch of the Machine Gun Corps. 📸 © IWM Q 5576

Soldiers of the 107th Infantry Regiment, American 27th Division, following behind tanks near Beauquesnes, on 13 September 1918. 📸 IWM (Q 57694)

British Mark I tanks fuelling up prior to the battle of Flers–Courcelette on 15 September 1916 during the battle of the Somme. This would be the first time tanks would go into combat. They were operated by the Heavy Branch of the Machine Gun Corps. 📸 © IWM Q 5576

14 September 1854: The Allied expeditionary force of 30,000 French, 26,000 British, and 5,000 Ottoman troops began landing unopposed in the Crimea at Kalamita Bay, 25 miles north of the city and naval base of Sevastopol, the objective of the Allied forces.

Pussy and Mickey, mascot cats of the Polish Merchant Navy ship SS Kordecki, checking out the ship's Oerlikon 20mm cannon.

60-pounders of the Royal Garrison Artillery (19th Brigade), on the move towards the Aisne on 12 September 1914. The First Battle of the Aisne was the Allied follow-up offensive following the First Battle of the Marne, which had stopped and thrown back the German sweep towards Paris. 📸IWM (Q 51496)

Soldiers of the 107th Infantry Regiment, American 27th Division, following behind tanks near Beauquesnes, on 13 September 1918. 📸 IWM (Q 57694)

60-pounders of the Royal Garrison Artillery (19th Brigade), on the move towards the Aisne on 12 September 1914. The First Battle of the Aisne was the Allied follow-up offensive following the First Battle of the Marne, which had stopped and thrown back the German sweep towards Paris. 📸IWM (Q 51496)

Soldiers of the 1st Battalion, Middlesex Regiment (Duke of Cambridge's Own) coming under German artillery fire on the Signy-Signets road on 8 September 1914, during the First Battle of the Marne.

James Robertson's photo of the dry docks at Sevastopol before their destruction by British and French engineers over the winter of 1855-56. After an 11-month siege, the Russians evacuated Sevastopol on 9 September 1855, allowing the Allied army to take control of the city and Black Sea Fleet base.

Spectators gather to watch USS New Ironsides bombard the Confederate-held Fort Sumter and Fort Moultrie in Charleston harbor in September 1863 during the American Civil War. One of the first photos ever taken of combat. Photo by Philip Haas and Washington Peale.

Soldiers of the 1st Battalion, Middlesex Regiment (Duke of Cambridge's Own) coming under German artillery fire on the Signy-Signets road on 8 September 1914, during the First Battle of the Marne.

4 September 1939: In the first RAF Bomber Command raid of the Second World War, Bristol Blenheims of No. 110 and No. 107 Squadrons and Vickers Wellingtons of No. 9 and No. 149 Squadrons targeted German shipping at the ports of Brunsbüttel and Wilhelmshaven.

Spectators gather to watch USS New Ironsides bombard the Confederate-held Fort Sumter and Fort Moultrie in Charleston harbor in September 1863 during the American Civil War. One of the first photos ever taken of combat. Photo by Philip Haas and Washington Peale.

French troops approach Belgian soldiers to seek internment in the aftermath of the Battle of Sedan (1-2 September 1870). Belgium mobilised 60,000 men to keep watch on its borders during the Franco-Prussian War. There was fear that France or Prussia might use Belgian territory to outflank each other.

4 September 1939: In the first RAF Bomber Command raid of the Second World War, Bristol Blenheims of No. 110 and No. 107 Squadrons and Vickers Wellingtons of No. 9 and No. 149 Squadrons targeted German shipping at the ports of Brunsbüttel and Wilhelmshaven.

French troops approach Belgian soldiers to seek internment in the aftermath of the Battle of Sedan (1-2 September 1870). Belgium mobilised 60,000 men to keep watch on its borders during the Franco-Prussian War. There was fear that France or Prussia might use Belgian territory to outflank each other.

German soldiers breaking the border barrier in the Polish town of Sopot (Zoppot) on the morning of 1 September 1939.

Soldiers of the German 76th Infantry Regiment moving towards the burning village of Lichnowy in Pomerania on 1 September 1939. 📸 IWM (MH 18224)

Russian soldiers, taken prisoner following the 1915 Gorlice-Tarnów offensive, are seen dragging their machine guns into captivity. Russia utilised two variants of the Maxim gun, specifically the Model 1905 and the Model 1910, both of which were equipped with wheeled mounts. 📸 IWM (Q 56996)

Polish destroyer Błyskawica or Grom sailing under the Forth Railway Bridge in Scotland on 1 September 1939, following the evacuation to Britain of the three destroyers of the Polish Navy, the Burza, Błyskawica, and Grom, to prevent their capture or destruction by the Germans.