That is a German V1 rocket propelled bomb. No worries as long as you could hear the engine running. When it stopped it was a glider and the engine thrust was designed to keep it flying level. When the fuel ran out it immediately nosed over in a straight down dive.
That's a lot of anti-tank rifles!
Not a rocket. used a jet engine (Pulse jet). Shutter on front opened and closed rapidly, giving it a distinctive sound. "Buzz" bomb.
I assume it had a timer that shut off fuel and nosed it over.
I belive that it was origionally called a Ramjet.
My Mrs' stepdad's uncle (if you follow) was a mature Bavarian in early 1945. The local Polizei showed up at the house and told him "Ivan ist kommt. Pack your stuff and come with us. You're in the army, so pack light. If you don't want to do your sacred duty to defend the German Fatherland, we'll hang you. Choose now."
He went.
When the war was over, he walked home several hundred miles, caught some sort of infection/ailment/disease he was too exhausted to fight, and died, one more pointless casualty of the second world war.