Now that I know the definition of this word, it makes sense why Watson would use it to describe himself and Holmes in “Charles Augustus Milverton” in The Greatest Adventures of Sherlock Holmes.

Truculent – aggressively self-assertive; scathingly harsh; feeling or displaying ferocity

Usage: “With our black silk face-coverings, which turned us into two of the most truculent figures in London, we stole up to the silent, gloomy house.”

“Charles Augustus Milverton” is another Holmes tale that offers such an interesting plot twist that even Sherlock Holmes didn’t foresee it.