The allied powers used land as their mail gorund to fight on while the germans used the sea as a sneek attack bc the allied powers didn't see it coming that is how the ussr was sank bc of a surpisre attack from the Germans .
There really isn't anything positive for a war at all just mostly negative and the bad things are the following: Lost so many innocent lives, soldiers lost their lives from wars and in camps and prisons, so much money that could've been used for better purposes was wasted on some war, and countries went from allies to enemies even to this day.
Probably Justinian, established Justinian Code and improved the foundations of the Byzantine Empire.
