Calais migrant crisis: Defending borders and saving lives is a military matter

There can hardly be a crueller contrast than the one on display at the Calais end of the Channel Tunnel. On the one hand, the queues of cars laden with British families on their way to or from a continental holiday, all sunhats, tanning cream, and smiles. On the other, groups of mostly young men scaling metal fences, clambering aboard lorries and jumping onto trains in the desperate hope of reaching the land of their dreams.