Yeah you've got the right idea, it's a knight frenzy. Very much brute force, so it's far from a great puzzle, but the knight party is awesome.

1. e8=N+ Kxh7 (...Kf7 2. Ne5+ Ke7 3. d8=Q#)
2. Nef6+ Kg7
3. Ne6+ Kf7
4. d8=N+ Ke7
5. c8=N#