Today I felt like I mattered. Faced with yet another Nordenwatch spawn point farm I went around and joined 2 other players in capping Lighthouse and Fortress. When we get to Barracks I start reading complaints about how people "haven't had a single heal since the beggining of teh SC QQ". Since we were done capping anyways, I bravely rode my steed headfirst into the red multitude and kicked them with my new morale 4 goodness and started healing away. Sure enough, we drove them back and ended up winning it. It's not like I was the only healer because I wasn't, and I wasn't near the top of the healing chart. But my efforts made a difference. We capped the flags for time enough to swing the points in our favor and eventually kept enough people up for us to drive them back.It sounds like you picked up reinforcements when you ran into them with the morale 4. I'm not sure if they came in from another direction but for the purposes of this exercise, I will assume they came in from behind the enemy from the Fortress and the enemy noticed the flank in time to react to it. (A flank really only works if you can get it off without being noticed, against a poorly organized group, or with some clever strategy.)
What the enemy force should do in this case is push all their forces into the weak side of the flank (side that's easier to kill, not necessarily the side with fewer players), even if that means temporarily giving up the objective to prevent the wipe. Once the weak side is taken out, they would turn around and push the strong side. In order to stop the flank from working, they must eliminate the weak side before the flanks collapse on them.
I do flanks all the time. My guild calls one the Hammer and Anvil strategy. We used it mainly in the city prior to version 1.3.5. Since that content is no longer in game, it won't hurt to share that strategy now. :) We would park 1 group at 2 different objectives consisting of 2 tanks, 2 dps, 2 healers OR 3 tanks, 1 dps, 2 healers. These are the Anvil groups. The other two groups would be parked in between the two objectives and consist of usually 1 tank, 3 dps, 2 healers. These are the Hammer groups. Once an enemy force commits to hitting an objective assigned to an Anvil group (the perceived "weak" group, but actually harder to kill, so it's the strong group), we'd take our Hammer groups and smash them from behind where all their healers just happen to be sitting most of the time.
Basically, it's convincing the enemy to beat on our tank groups while our DPS groups burn them down. The only way to beat that strategy to engage the Hammer before it reaches the Anvil. It also gets into the enemies' heads making them think that they can't even beat our "weak" group. (In actuality, what they perceive as the "weak" group is actually the strong group.) Once you break them psychologically like that, it's easy to turn the fight around and win, as Sara noticed in her Nordenwatch.
Nice work Sara.