Lewis & Short

circum-grĕdĭor, gressus, grĕdi, v dep [gradior], to go or walk around, travel about (esp. in a hostile manner; post-Aug., several times in Tac, elsewhere rare).

        1. (α) Absol., Tac. A. 1, 64, 2, 17; 12, 28.
        2. (β) With acc.: exercitum, * Sall. H. 4, 61, 21 Dietsch: terga, Tac. A. 2, 25’ Syriam, Aur Vict. Caes. 21’ lacunam, Amm. 16, 12, 59.