The Commonwealth War Graves Commission has 13 recorded WW1 deaths for the 19th Battalion, Royal Warwickshire Regiment.
CHANCE, A.S. Private, 28952. "A" Company, 19th Battalion, Royal Warwickshire Regiment. Grevillers British Cemetery, Pas-de-Calais, France. 29-09-1918. Age 19. Son of Albert & Phoebe Elizabeth Chance of 21, Hadcroft, Lye, Stourbridge, Wesst Midlands, UK.
I have at present, not found any record of a 19th Battalion, Royal Warwickshire Regiment, with the exception of the CWGC which has 13 recorded Deaths for the Battalion.