Batch create folder and move files

Hi,

I have files such as:

FD3_xxx1

FD3_xx2

Fd3_xxx3

FD63_xxx1

FD63_xx2

Fd63_xxx3

How would I create a batch file that would create folders with the characters before the "underscore" and then add the files into them. For example, all "FD3" files will go in a folder called "FD3" and all "FD63" files will go into a folder called "FD63".