European Carnage Tour Traveling was a European tour headlined by American thrash metal bands Slayer and Megadeth .

Slayer and Megadeth had previously toured Traveling together in North America on American Carnage Tour in 2010 , with Testament and Anthrax as the supporting Supporting acts .

Gary Holt of Exodus was announced Expressing_publicly as Jeff 's temporary replacement Exchange , in Slayer , on March 13 , to April 4 , 2011 .

Cannibal Corpse guitarist Pat O'Brien filled Filling in for Exodus ' Gary Holt when Holt left Departing the Slayer European tour Traveling to play Participation with his own band Exodus at the Estadio Nacional in Santiago , Chile on April 10 , 2011 .

Holt 's last show with Slayer was on April 4 , 2011 in Padova , Italy , O'Brien joined Participation the band for the April 6 , 2011 show in Croatia , and finished Process_end the European dates on April 14 , 2011 in the Netherlands .