1) Advance 2) Aggressive trespass 3) An encroachment or intrusion 4) An invasion or hostile attack 5) Attack while driving 6) Bit of progress 7) Damaging encroachment 8) Encroachment 9) Encroachment or intrusion 10) Enroachment 11) Exclusively Anglo word 12) Exclusively Saxon word 13) Foray 14) Forced entry Found on https://www.crosswordclues.com/clue/inroad
• (v. t.) To make an inroad into; to invade. • (n.) The entrance of an enemy into a country with purposes of hostility; a sudden or desultory incursion or invasion; raid; encroachment. Found on http://thinkexist.com/dictionary/meaning/inroad/
In'road` (ĭn'rōd`) noun The entrance of an enemy into a country with purposes of hostility; a sudden or desultory incursion or invasion; raid; encroachment. « The loss of Shrewsbury exposed all North Wales to the daily inroads of the enemy.» Clarendon. « W... Found on http://www.encyclo.co.uk/webster/I/66
In·road' (ĭn*rōd') transitive verb [ imperfect & past participle Inroaded ; present participle & verbal noun Inroading .] To make an inroad into; to invade. [ Obsolete] « The Saracens . . . conquered Spain, inroade... Found on http://www.encyclo.co.uk/webster/I/66