original_query: What were the main roles of the territorials in World War I?
query: What were the main roles of the territorials in World War I?
answer: Initially, Territorials filled the gap between the depleted regular army and the formation of the New Army, participating in defensive battles and freeing up regular units for other duties.  Later, they participated in major offensives on the Western Front, in Gallipoli, and in the Sinai and Palestine campaigns.