Ok, this is the information I have which I think related to your Uncle. I hope something matches up with the information you have and is the right solider.
Harold William Rodwell was born in the parish of Tannington 1882/3 (no DOB given) to William Rodwell.
Prior to the outbreak of war, he was a horseman.
He enlisted on 4th Feb 1916 to the Royal Horse & Field Artillery (service number 21606) before being transferred to the reserve battalion, the 3rd Battalion Northampton Regiment in 1917 which was an infantry unit. His new service number was 47732.
His height is recorded as 5' 9 1/2" (which is quite tall for the time) with a chester measurement of 38 inches with a range of expansion of 2 1/2 inches. He was classified as an A1 quality solider.
He was then reassigned to the 1/4th Battalion Northampton Regiment and embarked at Southampton on the 25/7/1917 bound for Alexandria. He arrived there on 20/8/1917 but didn't join his unit until 3/9/1917.
However, he reported sick on 14/11/1917 and didn't rejoined his unit until 3/2/1918.
He was wounded on 19/9/1918. He sustained a bullet wound to his right arm whilst in action in Palestine. He was transferred to 88th General Hospital. From here he went to Cairo on 30/11/1918 to await transfer back to the UK. He was repatriated on board HMS Trent on 3/12/18 (which looks to have gone back to Southampton from Alexandria via Gibraltar.
He was discharged from service on 8/3/19 being deemed as no longer physically fit for war service due to his wound which had left him unable to flex the fingers on his right hand. He was issued with a war pension for 52 weeks of 16 shillings and 6 pence as his degree of disability was classified as 60%.
He was awarded the service war badge (no B174487 issued 21/3/19), the British War Medal and the Victory Medal (His address at this time is recorded as Red House, Tannington).
Unfortunately the war diary for the 1/4th Battalion Northampton Regiment does not look to have been released online by the National Archives yet, but I think there is a lot there to go on so far without it.