CHALLENGE & REPLY 2nd edition are World War One naval wargame rules (now incorporating advanced rules and expanded mission generator):
There are two versions of the rules included; a print-friendly version, and a full-colour version!
Included in the rules -
Organising fleets
Squadron formations
Extensive Scenarios
Repairing ships
Reliability of ships
After the battle
Setting out the tabletop... [click here for more]