Edward Callow was William's nephew. He enlisted on 16th November 1915, and was discharged on 4th February 1919, having been found medically unfit for further service. He served in the 23rd Battalion of the Middlesex Regiment, which was part of the 123rd Brigade of the 41st Division and also known as the 'second football regiment' - a battalion raised in London and attracting many local footballers.

It does appear from the address William records that he served at headquarters as a signaller. This probably means he was a Battalion Headquarters Signaller who would carry messages or take ammunition or supplies to the front.

The division was posted to Italy at roughly the same time William Whitmore was there, though they don't appear to have seen action together in France.

Other battalions in the 123rd brigade included:

The 41st division was involved in several engagements which are listed below. Please note: as with all tables like this one, remember that it lists only engagements with the enemy. Troops would spend considerable amounts of time each year in the trenches, and within firing range of the enemy. Shelling and sniping would be a permanent danger, which lessened (but did not disappear) when there was no major engagement.

Campaign Battle Dates Present
Battle of the Somme Battle of Flers-Courcelette
(including the capture of Martinpuich)
15 Sept. - 22 Sept. 1916
Battle of Le Transloy 1 Oct. - 18 Oct. 1916
Flanders Offensive Battle of Messines 7 June - 14 June 1917
3rd battle of Ypres Battle of Pilckem 31 July - 2 Aug. 1917
Battle of Menin Road 20 Sept. - 25th Sept.
  Posted to Italy 17 Nov. 1917 - Mar. 1918
2nd Battle of the Somme (Picardy) Battle of St Quentin 21 Mar. - 23 Mar. 1918
First battle of Bapaume 24 Mar. - 25 Mar. 1918
First battle of Arras 28 Mar. 1918
Advance in Flanders Initial advance in Flanders 18 Aug. - 6 Sept. 1918
Battle of Ypres 28 Sept. - 2 Oct. 1918
Battle of Courtrai 14 Oct. - 19 Oct. 1918
Action of Ooteghem 25 Oct. 1918

Taken from The British Army in the Great War, and The Regimental Warpath.