serpents base rush on dragon

well i can tell u guys there is just one way to block it, mabe 2:

-make Spears , if he does musk kill tem with a few peas and spear it should be easy.
If he turns into canoneers u should be able to get horses. If he does sword hes dead anyway

-the other way is to put an archer tower and to put huts in the area arround, so he cant build near the tower and cant put a peas behind tavern