How can I watch my film?

About six months ago I downloaded a movie from iTunes on my iPad;

and yesterday I felt like watching that movie again, but after I watched it

the first time I deleted it from my iPad, as I took up too much room. When I

went into purchased and onto that movie the button said "Watch". I pressed it

and it took me to the videos app and said "No downloaded content". So far I

have found no way of re-downloading that movie. Could I have some help please.

Thanks!