On 16 June 1940, the Red Army invaded Estonia and organised a Soviet "coup d'état" in Tallinn. On 21 June 1940, the Independent Signal Battalion in Tallinn showed resistance to the Red Army, until it surrendered and was disarmed on the same day. The Soviet powers organised rigged parliamentary elections and the new parliament declared the Estonian SSR on 21 July 1940, which was annexed by the Soviet Union on 6 August 1940. Most county and municipal leaders were replaced and local assemblies were replaced with Soviets. The native population of Naissaar island was expelled from the island (as in 1914) as the island was turned into a military base. During the 1940–41 Soviet Occupation, thousands were executed, imprisoned, mobilised into the Red Army labour battalions or deported to Siberia on 14 June 1941 (June deportation).