 Complete the following phrase:  By early 1915, the Highland Division had lost six of its 12 pre-war Highland infantry battalions to Regular divisions. When TF divisions were finally ordered overseas as complete formations in their own right in early 1915, the Highland Division was only at half-strength and in no shape to be sent abroad at that time. Only by the last-minute addition of two Black Watch Royal Highlanders battalions and the North Lancashire Brigade from the West Lancashire Division was the division, now numbered as the 51st Highland Division, considered numerically complete and was rushed to the Western Front in May 1915 to help stem the latest German onslaught during the Second Battle of Ypres. Obviously, the lack of familiarity amongst these newly introduced disparate units hampered division efficiency and the division could only fare moderately in the further actions at 