During the 20th Century, battle included devastating effects on civilians due to advancements in weaponry. What were examples of the change in weapons? Air attacks from planes on non-specific targets but city blocks. Submarines were now common. Troops carried bayonets as well as guns. The use of the first hand grenades.
The first hand grenades were used in World War I, in 1914. While hand-thrown weapons had been created hundreds of years earlier, they were reinvented during WWI according to the different requirements of trench warfare.
