incursion

Etymology

From Middle English, borrowed from Old French, from Latin incursiō, incursiōnem.

noun

1. An aggressive movement into somewhere; an invasion.
   Fascinating though the journey is to the traveller, for many years this section of the line was a source of considerable anxiety to the maintenance engineers, and on more than one occasion landslips and incursions of the sea resulted in the railway being closed for several days. 1947 January and February, H. A. Vallance, “The Sea Wall at Dawlish”, in Railway Magazine, page 18