The Development of Warfare, 1848–2001

Crimean War (1853-1856)

Florence Nightingale: Known as the founder of modern nursing, she greatly improved sanitary conditions in British military hospitals during the war.
Charge of the Light Brigade (1854): It was a disastrous British cavalry attack caused by miscommunication which highlighted the importance of good communication in warfare.

American Civil War (1861-1865)

Industrialised Warfare: The civil war marked the first use of railways and telegraph for military purposes, inaugurating a new age of technological warfare.
Battle of Gettysburg (1863): This crucial Union victory helped turn the tide of war against the Confederacy.

First World War (1914-1918)

Trench Warfare: Characterised by mass armies living in lines of trenches, and marked by extreme levels of casualties.
Development of Tanks: Introduced to break the deadlock of trench warfare, tanks symbolise the rapid technological advancements during this war.
Use of Chemical Weapons: Both sides used gas as a weapon, inflicting heavy casualties and causing long-term health problems for the victims.

Second World War (1939-1945)

Blitzkrieg: This was a new German strategy emphasising speed and force concentration to quickly break through enemy lines.
Strategic Bombing: The mass bombing of civilian areas, especially by the German Luftwaffe against Britain and later by Allied forces against German cities.
Atomic Bombings of Hiroshima and Nagasaki (1945): The destructive power of the nuclear weapons marked a new era in warfare technology.

Cold War (1947-1991)

Nuclear Arms Race: The tensions of possible nuclear conflict between the USA and USSR dominated international relations during this period.
Proxy Wars: Indirect conflicts such as the Korean War and Vietnam War, where major powers support different sides to defend their interests.

Remember, for every topic, you should be familiar with key events, major shifts in military strategy, technological advancements and their implications on warfare. Try to connect these concepts to understand the comprehensive changes in warfare from 1853 to 2001.