ap-pugno (adp-, Halm), āre, v. a.,
to fight against , attack , assault (only in Tac. in the three foll. exs.): castra adpugnare, Tac. A. 4, 48: castellum, id. ib. 15, 13: classem, id. ib. 2, 81.
appūgnō (ad-p-) avī, —, āre, to fight against, attack, assault: castra, Ta.: classem, Ta. ...
An Elementary Latin Dictionary