Source: 18th Battalion Nominal Roll, April 1915.
Private Perry Clayton Stephen joined the 116th Battalion on March 27, 1916, at Port Perry, Ontario. He was shipped overseas and eventually joined the 18th Battalion on October 22, 1916. He served with this unit until he became seriously ill and left the Battalion on January 18, 1917, to go to England for treatment. He returned to duty with the Battalion on December 11, 1917, until he became ill again. He contracted German Measles and was sent for treatment on January 23, 1918. He was transferred to the 2nd Canadian Machine Gun Corps and served with that unit until he became ill again. He left active service on June 8, 1918, and eventually suffered from abdominal complications and was released from service on September 17, 1919.