According to his attestation papers dated January 21, 1916 at Mimico, Peter McGlynn of Mimico was born on March 13, 1891 in Lancs, England. He listed his father, Mr. John Thos. McGlynn of 26 Hillside Avenue, Darwen, Lancs, England as his next of kin. He indicated that he was a brassworker and that he had no previous military experience. He was 24 years and 10 months of age and stood 5 feet 8 inches tall. He had brown eyes and hair and a dark complexion. He was Roman Catholic.
He was posted to the 127th York Rangers Overseas Battalion.