A thermonuclear weapon weighing little more than 2,400 pounds (1,100kg) can produce an explosive force comparable to the detonation of more than 1.2 million tons (1.1 million tonnes) of TNT. A nuclear device no larger than traditional bombs can devastate an entire city by blast, fire, and radiation. Nuclear weapons are considered weapons of mass destruction, and their use and control have been a major focus of international relations policy since their debut.
...German methods to produce fission fuel suitable for atomic bombs ... fission bombs ... The documents indicate the weapon would have used a fission bomb to trigger fusion reactions in lithium deuteride fuel.