Russia accused Georgia of "aggression against South Ossetia" and officially launched a large-scale land, air and sea invasion of Georgia on 8 August under the guise of "peace enforcement" operation.[31] Russian and Ossetian forces battled Georgian forces throughout South Ossetia for four days, with the heaviest fighting in Tskhinvali, until Georgian forces retreated. Russian and Abkhaz forces opened a second front by attacking the Kodori Gorge, held by Georgia. Russian naval forces blockaded part of the Georgian coast. This was the first war in history in which cyber warfare coincided with military action. An active information war was also waged during and after the conflict.