Don't worry, I was just messing around. I'm not going to sweep someone's feet from underneath them on purpose because I don't see the point in hurting someone intentionally. Though I do recomment bringing a pair along if you have them in case of someone who's a bit to eager of taking the ball away from you (better safe then sorry, right?).
Also, a good/decent pair of running/football shoes (preferably those
without steal studs) is something worth bringing along.
But about the gravel and dirt part, you would be surprised how badly maintained some football-pitches are
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especially some amateur footballclubs I've come across when I still played football.