BBC1 个月
Which new weapons were used in the war?
But when World War One started they became weapons. Pilots could spy on enemy ... navy in the world but enemy submarines, called U-boats, were destroying ships. So a microphone was invented ...
BBC4 年
Which new weapons were used in the war?
But when World War One started they became weapons. Pilots could spy on enemy ... navy in the world but enemy submarines, called U-boats, were destroying ships. So a microphone was invented ...