The 1956 Hungarian revolution was the first major armed conflict that featured the AK rifle, and the first conflict in which it was used by both sides. The photo above shows an anti-Soviet Hungarian revolutionary named József Tibor Fejes with a captured AK.

The Hungarian Revolution of 1956 was an attempted countrywide revolution against the government of the Hungarian People’s Republic and the policies caused by that government’s subordination to the Soviet Union. The uprising lasted 12 days before being crushed by Soviet tanks and troops on November 4, 1956.

I believe, but can not confirm with any research that the rifle is a Type 3 AK specifically. Type 3s having been produced starting in 1955.