To save you some time, this is the website:

http://www.familysearch.com/eng/Library/fhlcatalog/supermainframeset.asp?display=titlefilmnotes&columns=*%2C180%2C0&titleno=742153&disp=Military_records_of_the_British_Army%2C_19

It starts with the "A"s, so you need to make a stab at the page number for your letter of the alphabet, then guess backwards or forwards until you find the Box which would include the right surname/forename. If you are very lucky you might see the name there in front of you!
Sue