Submarines were significant in World War I because they inflicted a lot of damage on shipping around Britain. They sank both military ships, supply ships, and anything else, which brought out the term unrestricted submarine warfare. To site a single example, the U-9 sunk three British cruisers within an hour. We also saw the strategy of the convoy appear in defense. The other significance of submarine warfare in World War I is that the capability of the submarine was clearly demonstrated, and the strategy and tactics (as well as the technology) was developed even further. World War II submarine activity was an extension of the lessons provided in the first war.
Why don't you just Google "World War 1 Submarines?"
Submarines were sometimes referred to as submersibles.
1, 200,000 Soldiers 30 Warships 11 Submarines.
Steel plates.
Atlantic Ocean.
2,200,000 Soldiers 97 Warships 40 Submarines.
Yes, German submarines were very effective in both world wars. The Germans built excellent submarines and still do.
The US helped France in world war 1 with submarines in the Atlantic.
Yes, many submarines were used in WW1 by most of the major combatants.
World War 1
U-boats=Submarines
The Germans were the first to use Submarines in World War 1. Now i believe that the marines now do at times.