The there are few things swords are good at:

1: They can be used to deal with Cavs, though Pikes and Warriors do a much better job.

2: They can be a poor mans cav smack. Get all the Traps/abs/trebs down, then send a 99,993 with pike, cav, phract, scouts, arch, bally, and pult layers. They can do well, though the same thing with pikes again, does a good job.

Other then these, they do well in a CD, but nothing else attack wise, sorry, I had the same ideas a while ago too.