Having served as curate in
Onslow in north-west Australia from 1910 to 1912, he was ordained as a priest in 1914, becoming curate of St George's,
Malvern. On the outbreak of war he enlisted as a private soldier and sailed for the Middle East in December 1915. He was later appointed chaplain to the
Australian Imperial Force, serving in Egypt and France until he was invalided back to Australia in 1917. In 1919 he published
As Private and Padre with the A.I.F. After a brief period as assistant chaplain to the
Missions to Seamen in Melbourne (1919-20), Tucker was invited to
Newcastle, New South Wales by the bishop,
Reginald Stephen, whose second wife was Tucker's sister Elsie. Stephen had also been the warden of St John's College in Melbourne when Tucker was training for ordination there. In 1920 Tucker was appointed to St Stephen's,
Adamstown, a parish near Newcastle, where he met
Guy Colman Cox who shared his dream of a community of serving priests. In 1930 they founded the
Brotherhood of St Laurence. Its four original members pledged to remain unmarried while part of the brotherhood, to live frugally and to practise an active community life. Tucker remained at Adamstown until 1933. He was appointed as missioner to St Mary's Mission within the parish of
St Peter's, Eastern Hill in Melbourne - both he and Guy Cox were licensed as curates in the same parish (1933). In 1939 Tucker recruited the pacifist and social activist (and future Chairman of the
Australian Board of Missions and
Archbishop-elect of Brisbane)
Frank Coaldrake to the Brotherhood of St Laurence to work in the inner-Melbourne suburb of
Fitzroy as a community worker. ==Food for Peace and Community Aid Abroad==