'On This Day' from culturepics.org

SENIOR OFFICERS OF THE BRITISH ARMY
21 July 1904
Imperial War Museum

Lieutenant Vincent Walter Kennett Mackinnon MID. Unit: 53rd Sikhs (Frontier Force), Indian Army. Death: 21 July 1915 Egypt & Palestine
Died 21 July 1915
Imperial War Museum

Major Gordon Stewart Drummond Forbes CMG. Unit: 7th Battalion, King's Own Scottish Borderers. Death: 21 July 1915, Western Front.
Died 21 July 1915
Imperial War Museum

THE FRENCH ARMY ON THE WESTERN FRONT, 1914-1918
21 July 1915
Imperial War Museum

AERIAL PHOTOGRAPHY ON THE WESTERN FRONT
21 July 1916
Imperial War Museum

AERIAL PHOTOGRAPHY ON THE WESTERN FRONT DURING THE FIRST WORLD WAR
21 July 1916
Imperial War Museum

Fête Nationale Belge - Grand Concert
21 July 1916
Imperial War Museum

GERMAN <REIHENBILDNER> AERIAL RECONNAISSANCE PHOTOGRAPHS TAKEN DURING THE FIRST BATTLE OF THE SOMME.
21 July 1916
Imperial War Museum

Private Edward Ernest Stacey 2064/265221. Unit: 1st/6th Battalion, Gloucestershire Regiment. Death: 21 July 1916, wounded and missing, Somme, Western Front. Commemorated on Thiepval Memorial.
Died 21 July 1916
Imperial War Museum

Private Fred Chadwick 1004. Unit: 31st Infantry Battalion, 8th Brigade, Australian Imperial Force. Death: 21 July 1916 Killed in action Age 25 Western Front
Died 21 July 1916
Imperial War Museum

Private John Edward Simmons 21772. Unit: 10th Battalion, Worcestershire Regiment. Death: 21 July 1916 Missing Western Front
Died 21 July 1916
Imperial War Museum

Private Norman Arthur Hale 702. Unit: "C" Company, 31st Battalion, 8th Infantry Brigade, Australian Infantry, Australian Imperial Force. Death: 21 July 1916, killed in action at Fleurbaix, France, Western Front.
Died 21 July 1916
Imperial War Museum

Second Lieutenant Cyril Vincent Noel Puckridge. Unit: 1st/5th Battalion, Gloucestershire Regiment. Death: 21 July 1916 Western Front
Died 21 July 1916
Imperial War Museum

THE BATTLE OF THE SOMME, JULY-NOVEMBER 1916
21 July 1916
Imperial War Museum

A Pumping Station
21 July 1917
Imperial War Museum

AERIAL PHOTOGRAPHY ON THE WESTERN FRONT
21 July 1917
Imperial War Museum

AERIAL PHOTOGRAPHY ON THE WESTERN FRONT DURING THE FIRST WORLD WAR
21 July 1917
Imperial War Museum

Gunner John Victor Bias 1750. Unit: 3rd Battery, 1st Brigade, Australian Field Artillery, Australian Imperial Force. Death: 21 July 1917.
Died 21 July 1917
Imperial War Museum

IWM to Conway, Mrs.
21 July 1917
Imperial War Museum

Lieutenant Valentine Leslie Douglas Uzielli. Unit: Royal Field Artillery. Death: 21 July 1917 Western Front
Died 21 July 1917
Imperial War Museum

Pumping Machinery
21 July 1917
Imperial War Museum

THE BRITISH ARMY ON THE WESTERN FRONT, 1914-1918
21 July 1917
Imperial War Museum

Turner, Isabel B., Mrs. to IWM
21 July 1917
Imperial War Museum

AERIAL PHOTOGRAPHY ON THE WESTERN FRONT
21 July 1918
Imperial War Museum

AERIAL PHOTOGRAPHY ON THE WESTERN FRONT DURING THE FIRST WORLD WAR
21 July 1918
Imperial War Museum

Arnold, Edward to IWM
21 July 1918
Imperial War Museum

IWM to Snell, J., Mr.
21 July 1918
Imperial War Museum

Second Lieutenant Robert Alexander Jameson. Unit: 1st/8th Battalion, Royal Scots. Death: 21 July 1918 Western Front. Husband of Mrs. A. F. Jameson, of 3, Sussex Place, South Kensington, London.
Died 21 July 1918
Imperial War Museum