Describe the battle of Jutland and submarine warfare during ww1?

The Battle of Jutland, was meant to be a decisive confrontation between battleships, but turned out to be an UN-decisive engagement between cruisers (battlecruisers). The British couldn't re-locate the German battleships (so they could fight) and the German battleships ran like rabbits back into port. There was no decisive battle.

German subs during WWI conducted "Guerre de Course" warfare; Commerce raiding. A war against merchant shipping (same as they did in WWII).