How does digestive system work together with lymphatic system? The relationship between them? Thank you

GALT. A large proportion of our lymphatic system surrounds the GI tract and is called the Gut-Associated Lymphatic Tissue; it is one of our body's first line of defense against infections as there can be many harmful microbes in our GI tract. For more information see http://www.vivo.colostate.edu/hbooks/pathphys/digestion/basics/gi_immune.html.