what are U-Boats and what role did they play in WWI?
U-boats deliver supplies to Russia and sank 5003 ships 94 children killed and 1201 men killed they had 500 men in combat and lost 178 U-boats. Campaign lasted 4 years and lost more than 5000 military men. U-boats are like submarines in the military shoot missiles and have a little dock. About 50 feet long and 20 feet round.