>>1081999i don't know if they exist in your country, semi-lusitanian monkey man, but in the first world we have these things we call "aeroplanes" which are like your carts but with things on the side like birds wings which enable them to fly. they can also drop things called "bombs", which is like your grapeshot, but encased in a metal tube and detonated by a magical substance we call "electricity".
there's literally no reason these explosive tubes, or "bombs" as we call them, cannot be filled with pigs blood or grease or fissile material which can be compressed to start a runaway chain reaction.