n. The entrance of an enemy into a country with purposes of hostility; a sudden or desultory incursion or invasion; raid; encroachment. [ 1913 Webster ]
The loss of Shrewsbury exposed all North Wales to the daily inroads of the enemy. Clarendon. [ 1913 Webster ]
With perpetual inroads to alarm,
Though inaccessible, his fatal throne. Milton.
v. t.
The Saracens . . . conquered Spain, inroaded Aquitaine. Fuller. [ 1913 Webster ]