gimp - Crop a big picture into several small size pictures

Is there a a way with GIMP editor to crop a big picture into several small equal sized pictures? So when all those small pictures connected in order would make a big picture.

Answer

We can easily slice an image to subimages along predefined guides using the Guillotine tool:

1. 
   

   Define Image > Guides > New Guides (by Percent) at 25% 50% 75% horizontal and vertical resp.

   
   

   

   
   


2. 
   

   Apply Image > Slice using Guides (in Gimp 2.8. Image > Transform > Guillotine) to slice into subimages:

   
   

   

   
   

To export the images in ready to use HTML code we can alternatively use a Slice python-fu script made for this purpose.