长驱直入
It was just a walk over.
eg:It was just a walk over for the army to take that castle.
中英俚语俗语来源:曹操·劳徐晃令:“所闻古之善用兵者,未有长驱直入敌围者也。”
同义词:势如破竹 Like a hot knife cutting through butter.
反义词:四处碰壁 Driven from pillar to post.