no one knows what happened on Roanoke island, scientists have only found a few clues to what happened.  The colonists only found the word 'croatoan' written on a fence post.  Modern day scientists found with their technology cannons buried underground and badges deep in the dirt.  

picture from here

 John White left for supplies with some of the other colonists that had came with him to try and start a colony in Roanoke when White came back he found absolutly no trace of them.  the houses and  buildings had all disappeared all they found was the word 'croatoan' written on a fencepost, White thought that they had moved south up to Hatteras island. 

  

 

 picture from here

There are many hypothesiss to what happend but no one has ever been sure.......

here is a video that helped me a lot.