The defense of Brest Fortress was the first battle of Operation Barbarossa, the Axis invasion of the Soviet Union launched on 22 June 1941. The German Army attacked without warning, expecting to take Brest on the first day, using only infantry and artillery, but it took them a week, and only after two bombardments by the Luftwaffe. Many defenders were killed or captured.

Brest Fortress, formerly known as Brest-Litoŭsk Fortress, is a 19th-century fortress in Brest, Belarus. In 1965, the title Hero Fortress was given to the fortress to commemorate the defence of the frontier stronghold during the first week of Operation Barbarossa, when Axis forces invaded the Soviet Union on 22 June 1941. The title "Hero Fortress" corresponds to the title "Hero City" that the Presidium of the Supreme Soviet of the Soviet Union awarded to twelve Soviet cities.