Sentence:  There was a Cow-Dung in the Path, and I must needs try my Activity by attempting to leap over it. I took a Run, but unfortunately jumped short, and found my self 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 <WSD>bemired</WSD> ... 
Meaning of the word marked with <WSD> tags:  To soil with mud or a similar substance.