sorry son, you will need a considerably higher ammount of troops to take a hut, i reccomend sticking to troops and building more of the other troop types to balance your army
giving a specific number of troops to take to a hut is difficult to say as the enemy number depends on how many troops you take, when i used to play grail i went once with 250 of all troop types and got killed very fast, on beta i took 600 of every troop inc merc and took the hut
keep building troops dude and good luck