Jutland peninsula is made up of the German Bundesland of Schleswig-Holstein. Schleswig-Holstein has two parts: the former duchies of Schleswig (Danish fief) and Holstein (German fief), both of which have passed back and forth between Danish and German rulers several times. The last adjustment of the Danish–German border followed the Schleswig Plebiscites in 1920 and resulted in Denmark's regaining Northern Schleswig ( or more commonly today: "Sønderjylland"). The historical southern border of Jutland are areas south of Kiel, Husum and Rendsburg, but the river Eider was the border between the former duchies of Schleswig and Holstein, as well as the historical
Battle of Jutland period were armed with guns firing projectiles of varying weights, bearing high explosive warheads. The sum total of weight of all the projectiles fired by all the ship's broadside guns is referred to as "weight of broadside". At Jutland, the total of the British ships' weight of broadside was , while the German fleet's total was . This does not take into consideration the ability of some ships and their crews to fire more or less rapidly than others, which would increase or decrease amount of fire that one combatant was able to bring to bear on their opponent for