What state and trigger events apply when you "put creatures onto the battlefield?"
It is distinct from casting or summoning. It is placing the creature onto the battlefield without casting. Normally creatures enter the battlefield by casting, but it's not the only way. 

So:


It doesn't trigger any "when you cast" abilities
The creatures enter the battlefield, so they trigger "When this creature enters the battlefield" abilities
The creature wasn't under your control since the beginning of the turn, so they have summoning sickness.