Both have a rag-tag group of warriors protecting a small village against a bigger force. The odds are stacked against the good guys and being greatly outnumbered, can they survive?
I am pretty sure that the makers of Seven Swords drew the idea from Seven Samurai. Both movies about seven skilled fighters who do their best to protect a village from certain enemies. Of course, Seven Swords is a Wuxia movie while the other is a Samurai movie.