[1] During the Nazi occupation in World War II, Sudmalis was one of the organisers of the Soviet guerrilla resistance movement in the territory of Latvia.
Soviet sources indicate he participated in the defense of Liepāja in June 1941, fighting with his Komsomol group against the German invasion forces, destroying a Nazi landing party near Rucava.
Following the restoration of Latvia's independence, on 21 July 1995 the statue of Sudmalis was relocated to the park of the Liepāja Museum.
There is also a memorial stone to Sudmalis (erected in 1962) at the Draudzības kurgāns (Burial-mound of Friendship) near Zilupe on the Latvian–Russian–Belarusian border.
Schools, Pioneer youth organizations, streets, kolhozes, and a vessel in the Soviet fishing fleet were named for Sudmalis.