The prize for the most useless weapon of all times goes to the Russians. They invented the "dog mine." The plan was to train the dogs to associate food with the undersides of tanks, in the hope that they would run hungrily beneath advancing Panzer divisions. Bombs were then strapped to the dogs' backs, which endangered the dogs to the point where no insurance company would look at them. Unfortunately, the dogs associated food solely with Russian tanks. The plan was begun the first day of the Russian involvement in World War II...and abandoned on day two. The dogs with bombs on their backs forced an entire Soviet division to retreat.