You have my sympathy. This time of year two years ago, travellers moved onto land next to the estate where my son lives.
It was the start of an absolute nightmare for him and the other residents whose houses were closest to the camp, the start of several months of antisocial behaviour, threats of violence, damage to vehicles and property, thefts in broad daylight from back gardens, the dumping of electrical appliances and other unwanted item into the canal that ran between the 'camp' and the houses, untaxed vehicles coming and going at all times of the day and night ... .
I could go on, but unless you have experienced it, you probably can't begin to imagine the stress that it caused, people fearing what might happen in the night, that their (or their children's) bedroom window might get a brick through it, or fearing that something will have happened to their home while they were out. There were times when my son was so scared by what was happening that he would ask me to have our 2 year old GD for the night.
Regular police patrols started, but of course they only had any effect while the police were actually there!
As for the mess that was left behind, it is still being cleared now, more than 18 months after the travellers finally got moved on.