There is a large cannon on the outskirts of the city, many citizens were surprised at its presence and considered it superfluous. But the time has come when they changed their minds and this happened when alien flying objects similar to saucers appeared in the sky. They did not just fly, but fired on the city, which means an automatic response on your part. Point the barrel towards the alien ships and aim fire until the ship explodes. Do not give them the slightest chance to shoot, defend the city and the people living in it in Blitz Alien.