Breakthrough

Adjective

 * 1) Characterized by major progress or overcoming some obstacle.

Noun

 * 1)  An advance through and past enemy lines (or vice versa).
 * 2) Any major progress; such as a great innovation or discovery that overcomes a significant obstacle.

Thesaurus
innovation, introduction, invention, leap, lightning attack, lightning war, mass attack, megadeath, mugging, neologism, new phase, novelty, offense, offensive, onset, onslaught, overkill, overture, panzer warfare, postulate, preamble, preface, prefix, prefixture, preliminary, prelude, premise, presupposition, proem, prolegomena, prolegomenon, prolepsis, prologue, protasis, push, run against, run at, rush, sally, shock tactics, sortie, strike, unprovoked assault, upgrade, verse, voluntary, wax, aggravated assault, aggression, amphibious attack, armed assault, assailing, assailment, assault, attack, avant-propos, banzai attack, blitz, blitzkrieg, boost, charge, coinage, counterattack, counteroffensive, coup de main, crippling attack, dead set at, descent on, discovery, diversion, diversionary attack, drive, exordium, flank attack, foreword, front matter, frontal attack, frontispiece, gas attack, head-on attack, hike, increase, infiltration,