He enlisted and joined the Dorset (Queen's Own) Yeomanry as a Private (Service No. 23094) and later transferred to the Labour Corps (Service No. 622879). It is not known in which theatre of war he served but after discharge he was awarded the Victory and British War medals. He married Eva Lucy Freer in the Birmingham South, Warwickshire, Registration District, in 1925 and they went on to have one son. By the time of the 1939 Register he was living at 84 Burman Road, Solihull, Warwickshire, and was described as a Finance Representative. His death was recorded at the Banbury, Oxfordshire, Registry in 1977.
Percival's brother Harold George (b.1878) also served in the war, with the Dorsetshire Regiment.