I've played a number of BTS games on Monarch/Emperor as the Russians, so in every game I used Cavalry, and while I still insist that the Cossack has been overnerfed and is one of the worst UUs I must say that it isn't all bad.
As many people have already mentioned the key is having a tech lead and getting riflery before everyone else. Obviously this is more difficult on Emperor than it is on Monarch.
My usual strategy is to start my first serious war with Cuirassiers, then beeline to riflery and upgrade all the cuirassiers into cossacks, from then on it's pretty easy and even riflemen are not very scary, especially if I go for Physics after Riflery to get airships.
I prefer Cossacks to riflemen for the reason that eventhough I use siege and am forced to move my stack 1 tile/turn Cossacks get to the frontline much quicker than riflemen, so I can get reinforcements quicker.
The problems start when AIs get infantry(on Emperor/normal speed it doesn't take all that long), since it is pretty difficult to win against infantry even with airships. At this point I am essentially left with a bunch of useless Cossacks, which can not be upgraded into anything for a very long time, obviously I wouldn't have this problem if I had used riflemen instead.
So in the end I would say that Cavalry/Cossacks are great if there's a significant tech lead, and are pretty useless if there isn't one, though still better than grenadiers.
As many people have already mentioned the key is having a tech lead and getting riflery before everyone else. Obviously this is more difficult on Emperor than it is on Monarch.
My usual strategy is to start my first serious war with Cuirassiers, then beeline to riflery and upgrade all the cuirassiers into cossacks, from then on it's pretty easy and even riflemen are not very scary, especially if I go for Physics after Riflery to get airships.
I prefer Cossacks to riflemen for the reason that eventhough I use siege and am forced to move my stack 1 tile/turn Cossacks get to the frontline much quicker than riflemen, so I can get reinforcements quicker.
The problems start when AIs get infantry(on Emperor/normal speed it doesn't take all that long), since it is pretty difficult to win against infantry even with airships. At this point I am essentially left with a bunch of useless Cossacks, which can not be upgraded into anything for a very long time, obviously I wouldn't have this problem if I had used riflemen instead.
So in the end I would say that Cavalry/Cossacks are great if there's a significant tech lead, and are pretty useless if there isn't one, though still better than grenadiers.