Heavy Brigade

A heavy brigade is a formation made up from 'Heavy' Cavalry; i.e. Dragoon Guards and Dragoons.
The Heavy Brigade was a British heavy cavalry unit commanded by General Sir James York Scarlett at the Battle of Balaclava in the Crimean War. The Brigade of 800 horsemen made a charge against Russian cavalry. The Russian force was in retreat and had halted. Although the Heavy Brigade's uphill charge was at no more than a trot, it put the much larger Russian force, of around 3,000, into disorder.
At the Battle of Balaclava the brigade was composed of 2 squadrons each of the 1st Dragoons, the 2nd Dragoons, the 4th Dragoon Guards, the 5th Dragoon Guards, and the 6th Dragoons.