There are two Extremely different translations of the chapter. One of which is Known for it's inaccuracies, while the other is always nearly spot on.
Granted, I as well read the bad translation myself first, which has Naruto stating he used "Futon: Kazekiri no jutsu",
In actuality, that was supposed to have been superimposed over the previous page, when Madara actually uses the jutsu to knock away all insects and the mist, revealing the assembled Shinobi Alliance, to which Naruto announces "Shinobi Alliance no Jutsu".
allanime01 is correct on his observations of the scene. It seems like Naruto knew that everyone was going to show up at that moment (Probably since he can sense chakra and hearts and such), so he assumed Multi Shadow Clone posture as a sort of taunt against Madara and Obito. Madara thinks "Oh, more Shadow Clones", and then a sudden mist appears and when he knocks it away, there's like a few thousand Ninja standing there.