they can be a serious threat to most units even heavy cavalry.
Only if you charge Heavy Cavalry, and can break them/reduce their front ranks. Otherwise, they are a liability, for two reasons. Heavy Cavalry hit hard. Very hard.
There are 4 classes of heavy Cavalry nowadays.
You have your Fast, or Light Cavalry, which are susceptible to anything, and any shots against them aren't really wasted. Any Light Cavalry.
You have Medium Cavalry, who hit hard, and have have a medium armour save (3/4+). They need to have attention paid to them to damage, but you can afford to target elsewhere. Boar Riders, Shield and Light Armour Marauders etc.
Heavy Cavalry, these are the general troops, like Bretonnian Knights, Empire Knights, and pretty much any 1+ Save Knights. Hit very hard, and require anything up to a cannon to deal with them - can sometimes even take an entire unit of Ranged soldiers to even cause a wound.
Super Heavy Cavalry are the Creme de la Creme. These beasts have multiple attacks, high strength, above average toughness, and usually the ability to take a Magic Banner, or even the Champion to take Magic Items, which range from Weapons, to Enchanted Items, to enhance your units performance. These are mainly Chaos Knights, Blood Knights, Dragon Princes, and Cold One Riders (both Elven and Saurisian).
Let's look at the last two. You charge them. Their armour (from a Str 6 blow) is reduced to 4, and you've wounded on a 2. Some Special Effects (Mark of Tzeentch, etc), gives them another chance to save the blow.
All in all, charging such Super Heavy Knights (who don't need to bother with the Charge) even with Great Weapons is not a good idea.
Point I'm making - Have flankers with Great Weapons. Have your holding units with a 2+ Armour Save - Hand Weapon, shield, and a 4+ Armour.
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