In the same year, he joined the Fabian Society, and helped to found The Neolith, a periodical of literature and the fine arts; the journal was printed in lithography.
The artist wrote a memoir of this time entitled Four Days: an account of a journey in France made between 28 and 31 August 1914, published by John Lane in 1932.
Pryse also saw some of the Battle of the Marne and the Aisne but was back in Belgium to record the fall of Ostend and the subsequent retirement along the River Yser.
[2] His main action was in the Third Battle of Ypres where he won the Military Cross, the 1914 Star, the Order of the Crown of Belgium, the Croix de Guerre.
Laurence Farrall, and they had three daughters, one of whom, Tessa Spencer Pryse, later a landscape artist, became an art student against her father's wishes.