
The French called them Cuirassiers and this name continuied to be used into the 19th century. Oliver Cromwell’s Ironsides were Kurassiers. Most cavalry of the Thirty Years War period were Kurassiers.
These horsemen evolved from the earlier Gendarme, or true knight. They were still the priveleged arm because everyone was self-equipped. The horse and armour were very expensive still. These people continued to see themselves as the elite of the battlefield. However, their role as Queen of the battlefield had been eclipsed by the infantrymen armed with pike and musket. Gradually kurassiers had given up their lances and replaced them with a pair, or more, of long wheel lock pistols. They no longer anticipated charging directly into the infantry because bitter experience had taught that disciplined blocks could not be broken and the pike kept them at bay. Only when a block was shaken was there any hope of surviving the impact. But once inside, then the nobleman on horseback could do what he did best: slaughter.
The tactic evolved in Europe to break a block of infantry before contact was the caracole. In the caracole a regiment of kurassiers would advance toward their opponents and halt. The front rank would advance, sometimes as close as 50 metres, turn their horses to the left, extend their pistols to the right with the mechanism on the top (so turned on its side just as punk gangsters do in movies today) and let rip. Then they would retreat to the back of the formation to reload while the next rank had a shot. And this would go on for a while until either the target formation showed signs of weakening, or the kurassiers had had enough and would retire. If gaps in the ranks started to appear, or if the infantry blocks gave any signs that they were upset by the attention and started to shuffle away, the kurassiers would ideally launched straight into an attack. At this range such an attack could only be at a trot, if that. Often the horsemen would just retire, having satisfactorily shot up the infantry without following up with contact.
During the course of the war military theorists, and this is generally attributed to Gustavus Adolphus but it is unlikely that he had the idea by himself, came to criticise the caracole. It was felt that it was not decisive enough. And this may be true. But in the context of largely amateur armies and unsteady finances a commander’s primary concern was probably trying to preserve what forces they had rather than risking them in all-or-nothing gambles.
This change in perception saw a change in tactics. Instead of the caracole kurassiers were trained to reserve their fire until they were close to contact. A contact that occured at the trot, that had already been committed to beforehand. It required a new kind of bravery, and a lot of training. Chances are it appealed to the vanity of the men on the horses. After all, here they were charging again, just like the old days. As the war progressed this became the more popular tactic on all sides.
The English labelled kurassiers that used this tactic ‘trotters’.