Send 15-25 of these into a large village and you just might come back with enough resources to level a few tiles or buildings.
There faster and they can only be seen if the village has a scout.
Plus there not considered attacks, because your scouting 
I was really tired when I wrote that ^ and I think I must have been out of my mind lol.
Here is the new version:
[Note: You're raid/scouting will be seen as an attack when sending in Equites Imperatoris
so if you want to remain stealth (Providing they have no scouts) don't send in the Equites Imperatoris]
When scouting a village it can sometimes take a while for the Scouts to arrive depending
on how far away the villages you're scouting are. And when they finally return saying that
the village has an abundance of resource, you have to send troops out again to raid them.
What if they spend them before you arrive?
I myself would rather send in a few scouts (Send in 15 is possible)
and at the same time send in as many Equites Imperatoris as you think may
be needed. I would send in no less then 5 and if possible send in 15-25.
I'm currently sending 44 of them, but only because their so fast it really doesn't matter
and this will reduce the likely hood of loosing some troops.