His next reference to Lord Derby refers to a scheme that was introduced in the Spring of 1915 to bolster numbers in the armed services. Fuller details of the scheme can be found at this link but it had its origins in the simple fact that voluntary recruitment was never going to come up with the numbers needed to sustain a war that was consuming men and materials at an alarming rate.
As with so many cartoons of this nature, the facts are true. Those that were attested and then mobilsed under the scheme faced a baptism of fire on the Western Front and their chances of survival were diminishing as the war progressed. "What a Life" indeed