During the time of the Highlord Alexandros Mograine, High General Abbendis, Grand Inquisitor Isillien and Highlord Mograine established the Crusade. At that time, the Scarlet Crusade was quite a prestigious group.
Of course, this all changed when Mograine died.
Recklessness, stupidity and extremism were now part of the Scarlet Crusade's label.
However, the group still wielded significant power.
It could be said that in the Battle of the Plaguelands, the Scarlet Crusade was a force to be reckoned with.
Their numbers were comparable to Lordaeron's population. However, after the battle, the people of the Crusade were all affected by the fear of being made redundant and abandoned. To counter this fear, the Scarlet Crusade used an evil oath, which was bound to fail.
This attracted a large number of warriors to join their ranks, but after the fighting was done, they were only capable of making a living off their swords.