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Use "intrenching" in a sentence
"The Virginians had seized the heights on the Maryland side of the Potomac, and were engaged in intrenching themselves there."
"Stealing on tiptoe towards this latter piece of furniture, he retired with it into the remotest corner, and intrenching himself behind it, watched the enemy with the utmost vigilance and caution."
"English in India, with a happy contempt both for the enemy and for the elementary rules of war, were struck with a cold fit of caution: instead of marching straight upon and intrenching themselves in Adrianople, they vainly broke their gallant heads against the improvised earthworks of Plevna."