The most iconic images of the First World War are of the war on land. They depict the trench lines, the shell holes, and the barbed wire.

They show a generation of young men in uniform, living in holes dug from the dirt, rifle in hand, waiting for the next devastating artillery bombardment, but part of that same generation faced a very different war, one that was just as important in deciding the fate of Europe, but which is often forgotten in popular histories. This was the war at sea.

It was vital to the economic side of the war, as the Allies cut off Germany's supply lines from the outside world and so placed a squeeze on their opponents' military industries. Here events took place that would draw America into the war, providing the Allies with a new pool of manpower and so ensuring that the scales of the conflict tipped in their favor.

Many members of British society viewed war as a sport, a lethal one admittedly, but one played by gentlemen in the spirit of amateurism and fair play as it had been throughout the British Empire in the preceding decades. The bloody stalemate on the Western Front caught them unprepared for the dark arts of covert warfare which would be needed to avert defeat, gain the initiative, win the war and, ultimately, shape the peace.

Those operations would witness the evolution of an ad hoc coalition of stakeholders from the military, the political elite, academics, technical experts, various kinds of industry, the media, and even the artistic community, all of which came together to wage a variety of forms of covert warfare. Many of the programs were technically successful, and in some cases, they undoubtedly saved lives and shortened the war.

In the process, the administration and execution of covert warfare became increasingly well-organized and sophisticated. Given the nature of war, many operations and many technologies have to be covert in order to be successful, and that imposes limits on democratic oversight, but in the case of the First World War, the boundaries of what was acceptable under the bounds of morality and the laws of war were repeatedly challenged and extended by all the participants.

Concurrent with that, the powers of the British state were massively and permanently enhanced, but Parliament was rarely consulted and no mechanisms for internal consistency or democratic oversight were developed. In some cases that absence of democratic oversight was legitimate according to the needs and laws of war, but in other cases, it was not, and the democratic deficit which resulted has had lasting consequences.

World War II was also a conflict in which modern covert operations first hit their stride. From the jungles of Burma to the streets of Paris, spies, saboteurs, and commandos carried out missions built on secrecy and cunning.

Precise, self-contained operations could be as important to the outcome of the war as acts of massive destruction, whether it involved targeted assassinations, sabotaging key logistics, or counterintelligence to break up the enemy’s own rings. At the time, most of these operations were hidden from the public since that was the only way they could be successfully carried out, but in the years since, stories about various missions have emerged.

They paint a picture of incredible courage and ingenuity, whether in war zones, enemy territory, or far from the front lines. .