In the UK, Guy Fawkes fits the bill from my understanding of Benedict Arnold. He was part of a catholic plot to destroy the Houses of Parliament in 1605 using gunpowder stored in the basement. The plot was foiled when one of the group wrote to his cousin, who was an MP, warning him not to attend parliament on that day.

Source: Gunpowder, Treason, and Plot - P G Wasser

Probably not exactly the same, but in Soviet history, Andrey Vlasov fills the same shoes. He was a distinguished officer in the Red Army even before the Great Patriotic War. When the war started, he was successful in a number of engagements, and played a key role in the defense of Moscow for which he was awarded Order of Red Banner - one of the highest awards one could achieve. He was promoted to deputy commander of the Volkhov Front, and commander of the 2nd Shock Army which was in danger of being encircled. Efforts to save the 2nd failed and Vlasov himself was eventually captured. (The circumstances of his capture are kind of interesting on their own - a plane was sent for him to extricate him but he refused to board it and stayed with his men. He was hiding from the Germans in the countryside but his location was given up by a local Russian farmer.)

In captivity, Vlasov agreed to collaborate with the Germans and lead an army of Soviet PoWs against the Soviet authorities. The army was called "Russian Liberation Army" or ROA (from Russian). Vlasov denounced Communism and called for the overthrow of Stalin. The Germans were convinced enough to arm and equip an army from the ranks of Soviet PoWs but didn't trust them enough to put into actual combat. The only action that ROA was a part of that I'm aware is the liberation of Prague in 1945, just before the end of the war. At the end, Vlasov and his troops surrender to the Americans but was given up to the Soviets who executed him for treason.