A Bofors anti-aircraft gun on the Finnish minelayer Ruotsinsalmi. Ruotsinsalmi was armed with one 75-millimetre (3.0 in) gun, one Bofors 40 mm guns and two Madsen 20 mm anti-aircraft cannons. The vessel had three mine dropping rails, and could carry about 100 mines. Due to Soviet dominance of the Gulf of Finland and their strong presence at the leased Hanko naval base, the Finnish Navy’s operations were severely limited at the start of Continuation War. When the German advance progressed and the Finns captured strategically important islands on the gulf, the situation was reversed and the Red Fleet became bottled up near Leningrad.
Book "Finland at War: The Continuation and Lapland Wars 1941-45" by Vesa Nenye, Peter Munter, Toni Wirtanen and Chris Birks