Source: Michael Doyle Their Name Liveth For Evermore: The Great War Roll of Honour for Leicestershire and Rutland.
He was the son of Charles and Ada Vann. The War Diary entry for the 22nd March 1918 records. FREMICOURT. At 9.30am Transport moved back to about H.13.c. Sheet 57c. Two platoons of “C” Company withdrawn in the morning to the Army Line about J.8. and 9 Sheet 57c. and the remaining two in the afternoon. At 6.00pm All HQ details moved up and dug in and occupied a line just behind the Army Line about J.14.b. At 4.00pm Transport moved to PIONEER CAMP, LOGEAST WOOD G.1.b Sheet 57c. 1 man of the transport was killed by shell fire. What remained of the Companies were withdrawn to the new line J.14.b. Total casualties of the operations:- 2nd Lt. A. ASHTON, 2nd Lt. C. MILLWARD and 2nd Lt. W. BAXTER were killed in action. Captain R. BENTLEY, Lt. H. H. GRUNDTVIG M.C., Lt. F. J. MEGGITT, 2nd Lt. R. J. NAYLOR, 2nd Lt. O. H. SEWELL, 2nd Lt. E. BEDSON, 2nd Lt. C. O. R. STEVISON were wounded. Captain J. C. SPENCER, Lt. A. L. HICKS, 2nd Lt. N. H. STEVENSON, 2nd Lt. A. SUMMERS are missing. 30 other ranks were killed, 106 wounded and 81 missing.

Source: Leicestershire War Memorials Project.
William Charles Webster Vann was born in Blaby in September 1897. He was not famous but his story is one of an ordinary Leicestershire lad going to war and the family he left behind. his story can be traced through a complete set of documents saved by his sister Ivy, and found among her possessions when she died in 1974. The collection is now held by the Leicestershire Museums Service.
Aged just 18, William joined the 11th Battalion of the Leicestershire Regiment in October 1915. After 5 months training, the battalion went to France in March 1916. The men were part of the Midland Pioneer Corps, so their job was to build roads, bridged, dug-outs and to repair them when necessary. Few of the soldiers actually fought in the front line, but they would have visited the trenches as part of their work.
In March 1918 they were part of the 6th Division of the British Third Army which held the trenches between Arras and Bapaume. the Germans launched their last major attack, called Operation Michael, on 21st March. The 11th Leicesters lost 3057 men and there were altogether some 40,000 German and 38,000 British casualties on this day- the highest for a single day's fighting in the whole war.
William was killed in action on 22 March 1918, aged 20.
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From Leicestershire Museums Service Collection