Let me tell you about a Battle for Gilneas I just had.
It started off pretty poorly, with Horde getting smashed at Waterworks by an incredibly strong Alliance team containing, but not limited to, a fiendish Ret paladin, two healers (priest and druid), an infuriating Frost mage, and a CC-out-the-ass warlock, all from the same guild. I was healing on Fabulor, and they were really good at focus firing and keeping me chain silenced/feared/CC'd.
They quickly capped Lighthouse and Waterworks, and proceeded to pen us in around Mine. They couldn't actually take it, since we had our entire team + rez reinforcements there, but the 6-7 of them who were there did manage to siege us in quite effectively. They'd even retreat just away from the flag as a group and heal up before renewing the assault, something I don't know if I've ever seen before.
Naturally, Horde got a little surly, and a few tentative attempts at Waterworks and Lighthouse were shut down. At one point we repelled the Mine rush and could have taken Lighthouse, but only one other person came with me and the returning Frost mage annihilated us. :(
We've all been in battlegrounds like this, where the whiners and cynics just complain about everything and moan that there's no point in even trying. "Why even bother trying to take Lighthouse, we're just going to lose it, Horde sucks at PVP, bluhh bluhhh bluhhhh."
Why bother trying to take Lighthouse. Why indeed. Well, sometimes it's hopeless, sure, but I sure as hell prefer to TRY and at least make the other team earn their win, rather than just sit and be camped. And, oh, I dunno, sometimes these seemingly-futile efforts can pay off.
The futile battle at Mine continued for a while, and soon the Alliance had reached 1800 points and were nearing victory. (If you don't know, the match ends when one side reaches 2000 points.) However, one of our warlocks managed to sneak away and assaulted Waterworks...and the Alliance didn't care.
Waterworks flipped to Horde, but the score was like 1920-1300 or something, so it was obviously too late.
In base battlegrounds (Battle for Gilneas, Arathi Basin, and Eye of the Storm, without the central flag), your team doesn't accumulate points if you don't hold a base.
As soon as I saw Waterworks flip, I had the sudden realization that we COULD STILL WIN, because even if the Alliance stormed over and took it back immediately, it would take 45 seconds for them to actually control it again and gain points from it. Which meant the Horde could still win, if we prevented all other Alliance point gains.
But, the only way to do this was by capping Lighthouse, which had failed every time we had tried so far. And it would be child's play for their war engine to roll back and crush us at Waterworks or Lighthouse. Finally, we were literally like, a minute away from losing.
Lots of negatives. Lots of reasons not to bother, and just say "oh well, nice try, we got outplayed."
...I'm sorry, did I mention how this was the only possible path to victory? Therefore, there was no choice or debate involved here, and no point wasting time thinking about it. It was either take Lighthouse - RIGHT NOW - or lose.
Engatsu-Farstriders would have just whined, sulked, and accepted the loss. Because that's what losers do.
BUT NOT FABULOR.
Fabulor bee-lined it away from Mine, right through the enemy line, followed the river and hugged the mountain to avoid the 2-3 Alliance players headed over to assault Waterworks, and arrived at a completely deserted Lighthouse.
I assaulted the flag (waiting for the horrible stealthed rogue/druid/shadowmeld ambush which never came), cutting off their point gains, and settled in to wait for the long 45 seconds it would take to flip the base.
The Alliance score was 1980 points. Two ticks away from victory.
All the Alliance would have to do was swing back and kill me, a LONE HEALER, and re-take the base, then wait for those 20 precious points.
I don't know what they were doing, but I'm guessing they were still throwing themselves at Mine, enjoying the stomping they were handing us. They were trouncing us so bad that none of their team died - I know this because I was nervously looking for Alliance coming back from Mine, as well as from their starting base, where dead Mine attackers would have rezzed. And their players that went to Waterworks...stayed there, for some reason, instead of returning and...well, winning.
A shockingly uneventful 45 seconds later, and suddenly the Horde had a 3-cap. And holy crap, the points rack up FAST when you have a 3-0 lead. It wasn't long before we got the "Horde has gathered 1800 resources and is near victory" message. I nervously typed in /bg that I was the only one at LH, but essentially by the time I had hit enter WE FREAKING WON.
The moral of the story? Sometimes it's amazing DPS that wins battlegrounds, sometimes it's awesome teamwork, sometimes incredible healers. But sometimes it's simple strategy and basic knowledge about how the battleground works. Knowing when a battle is lost, and more importantly, when it's not.
But you know what? Sometimes it's attitude. Be TENACIOUS. Make them EARN that win, dammit! And most importantly, DON'T. FREAKING. QUIT.
This doesn't just apply to PVP, either - how many awesome raid kills have happened with one person left standing, because they refused to quit, even when it looked hopeless?
Finally, for crying out loud, don't get distracted by honorable kills or other elements that don't actually help you win. Don't fight on the road, don't obsess over the Eye of the Storm flag if you don't hold bases, and DON'T SURRENDER YOUR ONLY BASE WHEN YOU'RE TWO TICKS AWAY FROM WINNING.
It's like the achievement says.