Indian campaign to hard?

I've played through all campaigns on hard, and the asian dynasties are by far the hardest for me. After slugging through the chinese campaign, I am now at the last level of the of the indian campaign (fuck the level where you have to destroy the 8 barracks, which still has units spawn from the destroyed barracks).

This is impossible for me to beat. I am an average player I would think, but the british attack way to fast, way to hard. I train villagers the whole time. I collected all the treasures on my side. I tried building lots of units, doesn't work. I tried going strong economy, doesn't work. The first wave I can deal with, mostly sepoys and some rajputs make short work of the hussars. Although at the same time, groups of musketeers and grenadiers supported by cannons attack your flanks, forcing me to relocate my villagers and making me lose even more troops. This leaves me with around one minute for the second wave. I've built three stables to be prepared and built 30 sowars. They get slaughtered by the cannons and longbowmans. My sepoys also don't really stand a chance. And even if I am able to stop the second wave, I know a third wave will come AND some other enemy units attacked me from the flank, destroying buildings and killing villagers. Am I missing something or is it just a case of git gud?