The Estonian Cyberwar and Its Implications for U.S. National Security

On April 26, 2007, the small Baltic state of Estonia experienced the first wave of denial-of-service (DoS) attacks. Accompanied by riots in the streets, these cyberattacks were launched as a protest against the Estonian government’s removal of the Bronze Soldier monument in Tallinn, a Soviet war monument erected in 1947. These attacks targeted prominent government websites along with the websites of banks, universities, and Estonian newspapers. After three weeks, the attacks ceased as suddenly as they had begun, but not before the Estonian government undertook measures to block all international web traffic, effectively shutting off the “most wired country in Europe” from the rest of the world.
Forensic analysis by US for future defense

http://www.iar-gwu.org/node/65