Aired: Jul 26, 2014Tanks transformed the landscape of warfare, initially known as "land ships" t...
WW1: The First Modern War
Season 1 Episode 4: Under Water Killers
The German U-boats will launch a relentless assault on the Atlantic, aiming to destroy British naval dominance and cripple its vital supply routes, resulting in the sinking of over 5,200 ships by war's end.
