I did the same thing this year with some very tall hybrid poplar cuttings. I did it even on better, I just shoved them in the wet soil! I have no idea how much I got in. They are still living and in my opinion thriving! I seriously have no idea how you can kill these hybrid poplars sometimes. I found some that fell off my trailer after two weeks. I put them in a bucket of water and they sprouted!
I will say quite often I take my "normal" cuttings and soak them in a bucket of water with the root hormone for a week. Once I see all kinds of nodules coming off the shoots, I shove them in the ground. Does it help or not?? No clue, I think it works and that is all that matters!! :)