Neighbours cat is coming into my garden and regularly beating my cats up. My cats don't ever really leave our garden. My cats are siblings aged 11. The bullying cat is about 4. It's not cats fighting as mine don't stand a chance and end up cowering while being attacked. They have been scratched and bitten and the smallest had a lump taken out her ear. I have had to rescue my cats a few times.
I try to scare next doors cat away by shouting and hissing but it doesn't care, I even tried spraying it with water but it hasn't helped. I don't want to keep mine in as they enjoy being out and have always gone out.
I recently mentioned it to my neighbour when I saw them, I began in a jokey way but they got defensive and said cats fight and to get over myself.
What can I do to protect my cats without keeping them in all the time, which they would hate!