describe cow dung incident Gulliver's travel

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From the text:

"There was a cow-dung in the path, and I must need try my activity by attempting to leap over it. I took a run, but unfortunately jumped short, and found myself just in the middle up to my knees. I waded through with some difficulty, and one of the footmen wiped me as clean as he could with his handkerchief, for I was filthily bemired; and my nurse confined me to my box, till we returned home; where the queen was soon informed of what had passed, and the footmen spread it about the court: so that all the mirth for some days was at my expense."

attempting to leap over what exactly???