 Complete the following phrase:  The Northumbrian Division trained hard while manning the Tyne Defences, and was ordered to proceed to France to join the British Expeditionary Force BEF on the Western Front early in 1915. The 15th DLI landed at Boulogne on 18 April and the division completed its concentration in the area of Steenvoorde on 23 April. It went straight into action the next day in the Battle of St Julien part of the 