I was arrested and released by police after my neighbor accused me of threatening him and intimidating him aft?

he went in my backyard without permission and shut off the water there so i asked him why he did so, of course i was mad but i was in my yard and he jumped back in his. i did not threaten him and i had my family witnessing what happened he however had his wife out later. i have to go to court in a month now, and i want to know if i need an attorney to defend myself despite having 3 witnesses with me? there is an issue between the two of us regarding his crossing over on my land and installing an exterior door and sprinklers in my land , i made arrangement for a surveyor to come and outline the limit line between us and of course he is afraid he might pay a lot by that so he arranged the accusations against me in advance probably to bargain with me in court? Maybe