We were playing away to the World Cup finalists, second only to possibly the greatest team to ever play the sport. Who we had never beaten in an away series. Who humiliated us in our own World Cup in our own "Fortress Twickenham" last time we played them. Of course we didn't set the world alight with glorious free-flowing rugby. If we did win this series, it was always going to be a gutsy backs-against-the-wall type win.
We won that second test largely through defence. But to say we won the series largely through defence is just plain wrong - read the match thread from the first test. Everyone, bar no-one, is in agreement that England's defence was seriously poor in that game. We won that game because (among other things) despite being defensively poor enough to ship four (arguably five) tries, we were also good enough in attack to put 39 points on them.
We did attack well in the first test, to say we didn't is rewriting history, history from a mere 11 days ago. "Attack" means more than throwing the ball wide into the 13 channel and pacy 13s / wingers sidestepping defenders. England played in the right areas, built themselves a platform from a strong set piece, battered the defenders round the ruck with short carries and put Aus under pressure so they gave away penalties in kickable positions. That is "attack". Even if you ignore the two nice tries created through their playmaker George Ford (which in itself kind of weakens the "no creativity in attack" argument), they still attacked well enough to score 25 points which is a bloody good haul in an international. If you have possession and are using it to amass points, then you are attacking effectively; there's more than one way to attack in rugby and despite our pisspoor defence, in the first test our method was better than the Australians' method.
The second test was a different game, in different conditions, that panned out a different way. So we found a different way to win. Credit to the players and coaching staff for that, rather than moaning that we "didn't play enough rugby".
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But in the first test you were really good in attack, and we won that game too, so ...