73rd division's main role was to train and physically condition men for drafting as reinforcements for units serving overseas. by the end of 1917 the division's infantry battalions had largely completed their task and been replaced by training units, whereupon the division was broken up as a home defence formation. 546th and 547th field companies were redesignated army troops companies and embarked for the western front on 22 june 1918, landing at le havre the following day, and working in the third army and fourth army areas respectively from 7 july.