Submarines made up relatively small portions of each combatant's total fleet during WWI, but that didn't make them any less useful or deadly. Initially, nations followed the naval tradition of ...

The weapon would be the submarine, U-boats ... Jeremy Paxman explains Lord Kitchener's iconic recruitment PR campaign of WW1. Crushing defeat in the first battle of WW1. videoCrushing defeat ...

But when World War One started they became weapons ... Britain had the largest navy in the world but enemy submarines, called U-boats, were destroying ships. So a microphone was invented that ...