European examples of light cavalry included stradiots, hobelars, hussars, chasseurs à cheval, cossacks, chevau-légers, uhlans, and dragoons.
[1] Armies of the ancient Roman-Germanic wars made use of light cavalry as patrolling squads, or armed scouts, and often had them in the front lines during regional battles.
As an example, the Imperial German army maintained a marked difference between the sizes and weights of the men and horses allocated to the hussar regiments that made up its light cavalry and those of the other two categories.
[12] The early weeks of World War I saw light cavalry attempting to continue its long established function of being the "eyes and ears" of the respective main armies.
However, despite some early success, the advent of trench warfare and aircraft observation quickly rendered this role obsolete, except to an extent in the Middle East in 1917, and in Eastern Europe where light cavalry mounted actions on a diminishing scale continued to occur until the revolution of 1917 took Russia out of the war.