In *Solo: A Star Wars Story*, 

>! Han and Chewbacca delivered two cases of coaxium over to Enfys Nest,
>! who stated that they were most valuable in funding **"the Rebellion"**.

According to the Wookieepedia sources, [the event][1] took place around 10 BBY, but the Rebel Alliance [was founded][2] as late as in 2 BBY. Was the Alliance actually established earlier, after all, or did she refer to some other group of freedom fighters (unlikely!)?

  [1]: http://starwars.wikia.com/wiki/Solo:_A_Star_Wars_Story
  [2]: http://starwars.wikia.com/wiki/Rebel_Alliance