This isn't mine, I found it and thank whoever found this out. 

Roll Tide is a common phrase for Alabama, whose mascot is the Elephant. I searched William Blake and Elephant, which he had drawn and also noted the character of the elephant in his “Heaven and Hell” poem:http://famouspoetsandpoems.com/poets/william_blake/poems/1105.html
This poem uncovers various roles of the animals, including the tyger, and it seems to be more telling of this series and the RJ suspects and Jane, etc, than other poems. It’s worth a look.
                                                                                        - latidah