Six scenarios from the start of World War One, most with 'what if' variants, a couple of optional tweaks to the main ruleset, a simple campaign system, plus a pile of data cards for ships of the Royal Navy, German navy and Austria-Hungary.

Note the timescale in the description: 1914-1915. This means Jutland isn't included and will doubtless be in another supplement.

I got it when it was a 'deal of the day' and I'm very happy. Had I paid full price, I might well have been not so enthusiastic.