In my most recent game, I ousted 2 civs at the outset with my exploring warriors. They came across the enemy city, defended by one warrior, and I got my warrior to a hill in an adjacent square and attacked. This gave me enough land to corner the only remaining civ on the continent and take over a lot of free territory. And as I was fighting those wars, I did not compromise my culture. In fact, two of my three cities at that time were making wonders (Pyramids and Colossus) and the other was on a warrior (defense) > temple > settler > library... build queue. I defeated the other civ on my continent during the industrial age, expanded to some free islands, and ended up in a domination victory shortly after I started smashing through medieval England with hordes of tanks (airlifted en masse), bombers and battleships. The game worked itself out into a domination victory for me. I guess I lucked out, but it goes to show that sometimes ancient warfare is a good strategy.