Visa and Mastercard have both experienced denial of service (DOS) attacks against their websites in retribution for the WikiLeaks situation that has dominated the recent news.  This began with DOS attacks against WikiLeaks in an attempt to block access to the controversial material they were attempting to distribute.  Credit card companies have stopped selling their services to WikiLeaks which has generated attacks aimed at their sites.

Is this one of the first very visible examples of cyberwar and if so, what can we expect now that engagement has begun?  Share your thoughts.