Robert James Waddington enlisted in the army at some point probably prior to November 1915. As 77291 Pte R J Waddington he first served overseas with the Royal Army Medical Corps, going overseas some time from 1 January 1916 onwards. Based on the service record of 77299 Pte Thomas Moore, RAMC, he may have joined in early November 1915, passing through no.6 Company RAMC at Cosham and going overseas some time up to August 1917. (See also 77297 Pte Albert Edward Oldfield, who joined at the same time as Pte Moore and went overseas on 12 February 1916 to France to join 2nd Cavalry Field Ambulance.) Pte Waddington served with 30th Field Ambulance in 10th (Irish) Division, possibly going overseas in time to join them in Salonika, where they remained until transferred to Egypt, in September 1917. Engagements during this time included the capture of the Karajokois and the capture of Yenikoi in October 1916. The division then fought in Palestine, most notably in the Third Battle of Gaza, 1-2 November 1917, part of the Southern Palestine Offensive.
Pte Waddington was subsequently transferred to the infantry, probably being 'combed-out' of his RAMC role as the result of a relatively high medical grading. After passing through the infantry school of instruction, he transferred corps to the Royal Welsh Fusiliers under the regimental number 88299, serving in the 7th (Merionethshire & Montgomeryshire) Bn, Royal Welch Fusiliers, a Territorial Battalion which by this time was part of the 160th Brigade, of the 53rd (Welsh) Division.
Based on the service record of 88280 Sidney Higgs, 1/7th Royal Welsh Fusiliers, who was also formerly of the RAMC (regimental number 39622), Pte Waddington's compulsory transfer to the Royal Welsh Fusiliers probably took place after a transfer to base depot (possibly 'B' Depot at Kantara) at the end of May 1918, then to the Infantry School of Instruction at Zeitoun outside Cairo on or about 20 June 1918, joining the 7th Royal Welsh Fusiliers in the field on or about 6 July 1918.This would have put Pte Waddington in line to serve with the 7th Battalion at the battle of Megiddo, 18-19 September 1918. Per Wikipedia:
"At the climactic Battle of Megiddo 53rd Division was tasked with advancing across the Samieh Basin towards Nablus, to threaten the Turks' communication centre and block the exits to the Jordan Valley (the Battle of Nablus). It attacked in moonlight late on the first day (18 September), after a 20-minute bombardment, and 7th RWF (Royal Welsh Fusiliers) had captured all its objectives on the north side of the basin by 03.00 next day. The roads were very bad, and the Royal Engineers struggled to make a path for the guns, but the advance continued, and by the end of 22 September the Turkish army was shattered, its retreat was being harried by artillery and aircraft.
The advanced troops of the division were now south-east of Nablus, but 53rd (W) Division was ordered to stand fast and did not take part in the pursuit of the defeated Turkish army. For the next few days it was employed in clearing the battlefield and repairing the Nablus road. On 26 September it moved back to Tell 'Asur, and by 12 October it had moved to Ramle, where on 27 October it began entraining for Alexandria. The Armistice of Mudros ended the fighting in Palestine on 31 October. On 20 December demobilisation instructions were received and the first parties left for home on 22 December. The Indian battalions left in early 1919 as transport became available. The 7th RWF was one of the last British units to leave, being reduced to a cadre on 23 January 1920 and officially disembodied on 12 March."
For his service Pte Waddington was entitled to the British War Medal and Victory Medal, which he would have received some time after August 1921.
He is probably the Robert James Waddington who was born on 24 December 1883 to Thomas and Elizabeth Martha Waddington, and baptised on 24 February at the Church of St Mary the Virgin, West Derby, Liverpool. By the time of the 1911 Census this Robert was living in Toxteth Park at 46 Garmoyle Road Sefton Park Liverpool and married to Minnie. Robert was employed as an assistant schoolmaster and the couple had a young child, Irene Mildred. By the 1921 census Robert and Minnie were living at 53 Portman Road, Wavertree, Liverpool. Robert, by that time a Schoolmaster in the employ of the Liverpool Corporation Education Committee, worked at St Cleopas Church of England School, Beresford Road, Liverpool.