When was the Levee en Masse first declared?

Prussian military reforms begin

Fourth Coalition defeat Napoleon

Greek War of Independence begins

Opening of the Liverpool-Manchester Railway

France's km of railway track in 1870

Germany's km of track in 1870.

Clausewitz's On War published.

Jomini's Summary of the Art of War published.

British army adopted the Minié rifle

Crimean War begins.

Bessemer developed method to produce cheap, strong steel.

Wars of Italian Unification begin.

American Civil War begins

Seven Weeks War aka the Austro-Prussian War

Cardwell reforms of the British army begin.

Russo-Turkish War begins

Introduction of the Mauser bolt-action rifle, Maxim automatic machine gun invented.

Second Boer War begins

First use of gas

First use of tanks

Japanese Invasion of Manchuria

Italian invasion of Abyssinia

First use of V1 and V2 rockets