Y , I think so , in some ww2 photos u see Germans with mg and grenades at the ready position , if the Russians rush you , multiple grenades can be handy in the effect that the Russians would be scared and some would runaway or stay put in the ground . Off course grenades alone do little but can take a toll in the enemy advance towards u .
shot of the german 280 mm railway gun "lange bruno" ("lange bruno"). the firing range of the gun was 36.1 km. in 1937 three installations "lange bruno" were built.